Simplistically, a permutation is just the number of ways that we can arrange any number of objects in a set of things.
EXPLANATION:Here's an example:
Suppose I have three objects A, B and C, and I want to arrange them in all possible ways.
Well, we could have
A B C
A C B
B A C
B C A
C A B
C B A
Note that this is just 6 ways.
In mathematics, we often express the number of possible arrangements of N objects as N!.. the "!" is known as a "factorial."
➥ In the above example, we have 3! ways of arrangement = 3*2*1 = 6.
➥ Then, the number of ways to arrange 4 objects in a set is just 4! = 4*3*2*1 = .24.
➥ And the number of ways to arrange 5 objects in a set is just 5! = 5*4*3*2*1 = .120. Etc.
A condition where the blood vessels fill with plaque (fatty deposits) is called atherosclerosis whereas arteriosclerosis is when the blood vessels become rigid, less elastic. Both conditions are similar in that they both cause blood pressure to?
Answer:
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Los modelos científicos son importantes para representar los fenómenos naturales. Sin embargo deben ser 100% reales verdadero o falso
Answer:
True.
Explanation:
Scientific models are important to represent natural phenomena but they must be 100% real in order to know right and provide correct information about natural phenomena. If they are not 100 % real so they provide false or incorrect information about the natural phenomena. If they are 100% right then they will increase the knowledge and understanding of students so it must be 100 % real to gain complete information about natural phenomena.
*PLEASE HELP*
Which of the following best describes the role of the nervous system?
A. responds to all internal and external stimuli
B. detects only stimuli from outside an organism
C. responds only to stimuli occurring inside an organism
D. detects internal and external stimuli at the cellular level
I think it is A! The nervous system reacts to all internal/external, such as hormones, touch, sound, disease, etc
what are compulsory vaccinations?
Answer:
compulsory Vaccination is the health policy a government adopts in relation to vaccination .
What is taxonomy?
A. A system of classification based on homology
B. A system of naming
C. A system of classification based on analogy
Answer:
A) A system of classification based on homology
Explanation:
i hope this helped ;)
Sometimes you need to sort through the confusion and get back to______________. *
Answer:
Sometimes you need to sort through the confusion and get back to_____origin or question or starting _________.
Answer: nature
Explanation:
Please help me. no links I report you
I think the first graph, I'm not positive though.
i have a question for science.
question: why are most cells so small?
( what keeps them from growing so large)
Answer:
Cells are small so that material can cross the cell membrane fast enough. When a cell grows too large it will divide into smaller cells so cell division keeps cells from growing too large.
PLEASE HELP!!
if a farmer planted 20 000 seeds, how many would germinate? how would this affect his expenses
Answer:
over 10000
Explanation:
it affects because
3. Why do you think using a
pyramid shape is a good model
to show how energy moves
through an ecosystem?
TOUR
I
Answer: An energy pyramid shows the flow of energy at each trophic level in an ecosystem. A pyramid shape is used because energy is lost at each trophic level when organisms use it up
Explanation:
Three human disorders−−fragile X syndrome, myotonic dystrophy, and Huntington's disease−−are conceptually linked by a common mode of molecular upset. Choose the phenomenon that links these disorders. Three human disordersfragile X syndrome, myotonic dystrophy, and Huntington's diseaseare conceptually linked by a common mode of molecular upset. Choose the phenomenon that links these disorders. All three are caused by disparate genes, but each gene was found to contain repeats of the same trinucleotide sequence. All three are X-linked, but each gene was found to contain repeats of the same trinucleotide sequence. All three are caused by disparate genes, but each gene was found to contain repeats of a unique trinucleotide sequence. All three are X-linked, but each gene was found to contain repeats of a unique trinucleotide sequence.
Answer:
The correct answer is ''All three are caused by disparate genes, but each gene was found to contain repeats of a unique trinucleotide sequence.''
Explanation:
Four groups of trinucleotide repeats related to DNA expansion have been characterized in the human genome. CGGI GCC, CAGIGTC, CTGIGAC and recently GW CTT sequences. The CGGl GCC sequences are usually located in the noncoding regions of different genes and when expanded they associate with fragile sites on the chromosomes. The CAGIGTC repeats are part of the coding region and are related to different neurodegenerative disorders. You can try to make a classification depending on the unit that is repeated, having on one side a group that are caused by repeats of the CAG trinucleotide (cytosine, adenine, guanine). Huntington's disease (HD) is a progressive disorder of motor, cognitive and psychic function. The disease is inherited in an autosomal dominant manner, and is caused by the expansion of CAG trinucleotide repeats in exon 1 of the gene called huntingtin (HTT or IT-15). Unstable mutations have also been found in which the repeat unit does not is composed of three nucleotides, if not four, such as type 2 myotonic dystrophy, where the tetranucleotide CCTG repeats. Fragile X Syndrome consists of an abnormal expansion of the cytosine-guanine-guanine trinucleotide (CGG) in the FMR1 gene, which prevents intellectual disability and also influences the formation of connective tissue
which parrots were killed by predators
Answer: Raptorial birds especially the forest eagles, hawk-eagles, Accipiter hawks, and falcons are the most likely species to prey on adult parrots and macaws.
Explanation:
Answer:
i am a little confused do you mean what predators kill parrots or if it is predators then raptors like owls eagles and hawks cats like jaguars
Explanation:
Which of the following best characterizes injuries to the patagium? Injuries are–
A. rare and small injuries heal well.
B. frequent due to fighting between bats.
C. not likely to heal and bats usually die from them.
D. common during birth and can contribute to infant mortality.
The one that is not best characterized as injuries to the patagium is not likely to heal and bats usually die from them. The correct option is C.
What are injuries?
A loss of consciousness may occur as a result of repeated head injury from a car accident, a falling accident, or a slipping accident. In most cases, traumatic brain injury causes loss of consciousness. The proper treatment of critical injuries is critical for overall health and well-being.
An injury is a physical harm to your body. It is a broad term that refers to injuries caused by accidents, falls, hits, weapons, and other factors. Every year, millions of people injure themselves in the United States. These injuries can range from minor to fatal.
Therefore, the correct option is C. not likely to heal and bats typically die from them.
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I WILL PICK THE BRAINLIEST! Also I know the answer but this'll be a great way to earn extra points!
A Punnett square is used to —
A.
determine the location of mutated genes
B.
determine the parent alleles of the offspring
C.
determine the makeup of chromosomes
D.
determine the probability of offspring traits
Answer:
D. determine the probability of traits
What ecological process would be responsible for transforming this landscape?
A. primary succession
B. cyclical succession
C. seasonal succession
D. secondary succession
In meiosis, 2 cells have been created at the end of telophase 1, halfway through the process. These cells are said to exist in a haploid state with a diploid number. Explain the statement. Support your answer clearly
Answer:
In some species, cells enter a brief interphase, or interkinesis, before entering meiosis II. Interkinesis lacks an S phase, so chromosomes are not duplicated. The two cells produced in meiosis I go through the events of meiosis II in synchrony. During meiosis II, the sister chromatids within the two daughter cells separate, forming four new haploid gametes. The mechanics of meiosis II is similar to mitosis, except that each dividing cell has only one set of homologous chromosomes. Therefore, each cell has half the number of sister chromatids to separate out as a diploid cell undergoing mitosis.
Prophase II
If the chromosomes decondensed in telophase I, they condense again. If nuclear envelopes were formed, they fragment into vesicles. The centrosomes that were duplicated during interkinesis move away from each other toward opposite poles, and new spindles are formed.
Prometaphase II
The nuclear envelopes are completely broken down, and the spindle is fully formed. Each sister chromatid forms an individual kinetochore that attaches to microtubules from opposite poles.
Metaphase II
The sister chromatids are maximally condensed and aligned at the equator of the cell.
Anaphase II
The sister chromatids are pulled apart by the kinetochore microtubules and move toward opposite poles. Non-kinetochore microtubules elongate the cell.

Figure 1. The process of chromosome alignment differs between meiosis I and meiosis II. In prometaphase I, microtubules attach to the fused kinetochores of homologous chromosomes, and the homologous chromosomes are arranged at the midpoint of the cell in metaphase I. In anaphase I, the homologous chromosomes are separated. In prometaphase II, microtubules attach to the kinetochores of sister chromatids, and the sister chromatids are arranged at the midpoint of the cells in metaphase II. In anaphase II, the sister chromatids are separated.
Telophase II and Cytokinesis
The chromosomes arrive at opposite poles and begin to decondense. Nuclear envelopes form around the chromosomes. Cytokinesis separates the two cells into four unique haploid cells. At this point, the newly formed nuclei are both haploid. The cells produced are genetically unique because of the random assortment of paternal and maternal homologs and because of the recombining of maternal and paternal segments of chromosomes (with their sets of genes) that occurs during crossover. The entire process of meiosis is outlined in Figure 2.

Figure 2. An animal cell with a diploid number of four (2n = 4) proceeds through the stages of meiosis to form four haploid daughter cells.
Cheests as a species of cat best known for being the fastest land animal, with the ability to sprint at speeds of up to 120
Kilometers per hour, Cheetahs have small heads, lean bodies, long legs, and a yellowish-tan coat with distinctive black spots
Cheetahs face extinction pressure from climate change, hunting by humans, and habitat destruction, which is reducing the size of
their populations, Predict how these pressures have affected the genetic diversity of cheetahs.
Answer:
Genetic diversity has decreased due to inbreeding due to dwindling population size.
Cheetahs are facing great pressures, such as climate change, destruction of their habitat, and also hunting by humans that have greatly impacted their genetic diversity.
What are the causes of inbreeding in Cheetahs?Cheetahs have experienced a very declining rate of their populations due to destruction of their habitat, and also hunting by humans that has resulted in inbreeding in their populations and loss of genetic diversity.
Due to inbreeding, cheetahs have become more exposed to genetic disorders and vulnerable to diseases, and other threats.
Climate change has also posed a great threat to the declining population of cheetahs as it has affected their habitats and food resources. Climate change causes alteration in the temperature and rainfall pattern resulting in low availability of prey and water resources. Therefore, climate change leads to the malnutrition of cheetahs and making them more susceptible to severe disease.
Therefore, cheetahs are facing extinction due to climate change, habitat destruction, and hunting by humans.
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Question 1 (1 point)
Which of the following functions in homeostasis, information processing, and controlling movement?
Epithelial tissue
Connective
Nervous tissue
Neural network
Muscle tissue
Answer:
nervous system
Explanation:
Question 24 (6 points)
✓ Saved
Within a forest and stream ecosystem, there is a food web that includes grasses,
rabbits, grasshoppers, foxes, and snakes. Answer the following questions for 2
points each:
1. Identify TWO density-dependent limiting factors that could affect the rabbit
population.
2. Explain how a shortage of ONE of the limiting factors would impact both a large
population of rabbits and a small population of rabbits.
3. Identify ONE other organism for which the rabbits would be a limiting factor and
explain how the original limiting factor in question 2 would affect the second
organism.
Answer: Question 24 (6 points) ✓ Saved Within a forest and stream ecosystem, there is a food web that includes grasses, rabbits, grasshoppers, foxes, and snakes. Answer the following questions for 2 points each: 1. Identify TWO density-dependent limiting factors that could affect the rabbit population. 2. Explain ...
Explanation:
a food web that includes grasses, rabbits, grasshoppers, foxes, and snakes. Answer the following questions for 2 points each: 1. Identify TWO density-dependent limiting factors that could affect the rabbit population. 2. Explain ...
Which principle allows us to assign dates to events on the geologic time scale?
faunal succession
extinction
radioactive decay
relative dating
The principle that allows us to assign dates to events on the geologic time scale is radioactive decay. Therefore, option (C) is correct.
What is radioactive decay?This theory is based on the observation that certain isotopes of elements are inherently unstable and, as a result, decay over time, giving rise to the formation of new isotopes or elements. Scientists are able to determine the age of a sample by measuring the ratio of parent to daughter isotopes in the sample. This, in turn, enables them to assign dates to events on the geologic time scale.
The method of determining the age of rocks, minerals, and other geological materials is known as radiometric dating, and it is utilized extensively in the field of geology as well as in other earth sciences.
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Before the glucose food can be used by a cell, it must first be transferred into an usable form of energy known as
A. DNA.
B. Proteins.
C. ATP.
Answer:
ATP. .......... .........
Choose all that apply for Grasslands
Question 3 options:
no trees and shrubs
Contains grasses and woody plants
rainfall is low
occur in all climatic zones
Choose all that apply for Savanna
Question 4 options:
rainfall is moderate
occur in sub tropical and warm zone
scattered trees and shrubs
contains only coarse grass
How does a fire help grasslands?
Choose all that apply
Question 7 options:
keeps trees from overtaking the grasses
all of the choices
preserve biodiversity
helps contain only coarse grass
What type of grasslands are found in the United States?
Question 9 options:
plains and prairies
steppes
velds
pampas
PLEASE HELP ME!!!
Answer:
number 4
A,B,C
number 3
A,
Grasslands have no trees and shrubs, contains grasses and woody plants, and rainfall is low.
What do you mean by Grasslands?Grasslands may be defined as area in which the vegetation is dominated by a nearly continuous cover of grasses.
Savannah is a type of grasslands where there is moderate rainfall that contains scattered trees and shrubs.Fire helps grasslands by preserving biodiversity. The type of grasslands found in the United States is plains and prairies.
Therefore, all the questions are discussed above one by one.
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An airplane flies from Minneapolis to Chicago in 62 minutes.
If it is 572,000 meters from Minneapolis to Chicago, what is the plane's average speed?
A. 2,000 m/s
B. 355 m/s
C. 154 m/s
D. 119 m/s
Answer:
154m/s
Explanation:
Average speed= distance(m)/time(sec)
Distance=572,000metres
Time=62×60=3720seconds
As=572000/3720=153.76aproximately154m/s
echidnas hatch from an egg and delicious as they mature m. Why do the echidnas have bristles with different thicknesses?
Investigate the optimal amount of foliage for the green,
long furred slinquettes' population.
Answer:
k
Explanation:
What is the purpose of a seed coat? (Select all that apply.)
A. protects the seed from damage as it travels
B. provides food for the seed
C. helps the seed begin photosynthesis
D. keeps the seed from drying out
The immune system has both specific and nonspecific defenses against viral infections. Which statement describes a nonspecific response of the immune system in fighting viral infections?
A. T cells are produced to search out and destroy the viruses.
B. Memory B cells are activated to rapidly respond to the viral infection.
C. Plasma cells quickly replicate and release antibodies that bind to the viruses.
D. Virus-infected cells produce interferons that lead to the inhibition of viral replication
Answer:
C
Explanation:
I just did this same question
Virus-infected cells produce interferons that lead to the inhibition of viral replication and act as a nonspecific response of the immune system in fighting viral infections. Therefore, the correct statement is option D.
What are interferons?The immune system has two types of responses to viral infections: specific and nonspecific. Interferons are signaling molecules produced by virus-infected cells to activate antiviral defenses, such as apoptosis in infected cells. This refers to the nonspecific response of the immune system in fighting viral infections
Interferons function by alerting the immune system about the presence of a viral infection. Interferons can also stimulate the production of other immune cells, such as natural killer cells and macrophages to eliminate the infected cells.
Interferons have been also used to treat viral infections, such as hepatitis B, and are the nonspecific defenses that act as a first line of defense against viral infections.
Therefore, interferons that lead to the inhibition of viral replication are the nonspecific response of the immune system in fighting viral infections.
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The Trans-Pecos ecoregion in the western portion of Texas
receive less than 38 cm of rainfall a year and has little soil due
to overgrazing by farm animals. What catastrophic event is
most likely the cause the most weathering and erosion in the
least amount of time in this ecoregion?
1.Wildfire
2.Earthquake
3.Flood
4.Tornado
Answer:
3.Flood
Explanation:
Flood is the catastrophic event which is the main cause of the most weathering and erosion in the least amount of time in this ecoregion because there is no vegetation present in this region and the soil is vulnerable for erosion. Flash-flooding and rapid runoff are agents of erosion in the Trans-Pecos ecoregion of Texas whenever the rainfall occurs. Vegetative is very important for preventing soil erosion so the people of this region has to stop overgrazing in this area in order to avoid more erosion of the soil.
why do snails like leaf litters
Answer:
They will eat the biofilm that grows on the leaves. My snails love my oak leaf litter, as do my loaches. They eat the film off them.
Explanation:
5. Explain the genotypes and phenotypes of skin color.