Answer:
See explanation.
Explanation:
Physical changes only change the appearance of the object/substance.
Chemical changes are irreversible and can change the chemical makeup of the object/substance.
You can also use your senses to tell: being smell, sight, etc.
According to most theories about the evolution of early life on earth, the atmosphere had an abundance of ammonia, methane, and carbon dioxide, shown above. Free energy from lightning could have allowed chemical reactions to occur that generated the precursors to life on earth. Which inorganic molecule(s) are accurately paired with their role in the formation of organic molecules necessary to life?
A) Ammonia would have provided the nitrogen found in the amine groups of amino acid and the nitrogenous bases in DNA.
B) Methane would have provided the hydrogen to form water, a universal solvent for chemical reactions supporting life.
C) Ammonia would have provided the electrons to generate ATP using an electron transport chain within the mitochondria.
D) Carbon dioxide would have provided the oxygen needed to perform photosynthesis, resulting in the production of glucose.
Answer:
A
Explanation:
The correct option would be A.
The presence of ammonia in the atmosphere of primitive earth provided the nitrogen found in the amine groups of amino acid and the nitrogenous bases in DNA. This has been proven through the simulation experiment of the primitive earth's atmosphere by Stanley Miller and Harold Urey.
The water in the primitive atmosphere was formed from the condensation of water vapour from volcanoes that were characterics of the earth's environment while oxygen in itself is not needed for photosynthesis but a by-product of it.
All scientific investigations begin with:
a) Forming a hypothesis.
b) Conducting an experiment.
c) Asking a question or
observing a problem.
d) Forming a conclusion.
Answer:
a) forming a hypothesis
All scientific investigations begin with asking a question or observing a problem.
Option C is correct.
How do we explain?Scientific investigations begin with a question or a problem that the scientist wants to answer or solve. Once the question or problem is identified, the scientist can then develop a hypothesis, which is a tentative explanation for the question or problem. T
he hypothesis is then tested through experimentation.
Therefore, Option C is correct.
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What are some non examples of environmental systems.
Machine operating is the non examples of environmental systems.
What is environmental systems ?The environmental system can be defined as an ecological sense as the set of interactions between the elements of the biosphere and it includes the atmosphere, the hydrosphere, the lithosphere, and the ecosphere.
The atmosphere is composed of nitrogen (78%), oxygen (21%), and other traces of carbon dioxide, argon, water vapor, Although the atmosphere is approximately 1,100 km high, the stratosphere and the troposphere are the main atmospheric interactors.
The hydrosphere consist of water in all form like solid, liquid, and gas and dissolved elements like sodium, magnesium, calcium, chloride, and sulfate.
The lithosphere which is a thin crust between the mantle and the atmosphere, it is around 100 km thick, it can be considered in interaction with the biosphere; Main components are oxygen, silicon, aluminum, iron, calcium, sodium , potassium and magnesium.
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In your own words, define the term science.
Answer:
science is the application of knowledge in the study of social and natural environment
The term science states that it is a process and application and knowledge to an understanding of the natural and social world, which is a systematic methodology dealing with the evidence.
What is the term science?Science majorly deals with the evidence, which is supported by the theory and provides knowledge of any particular subject, supports the evidence.
Science is defined as the observation, knowledge, investigation, and experimental and theoretical approach to any which explain any natural phenomena. It can be a way of learning the natural world through observation and logical reasoning.
Therefore, science depends on observation of any natural phenomena which is supported by the evidence and fulfills both the experimental and theoretical approach.
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What is the scientific name for a robin ?
Determine the median value for foot width for males and for females.
The data set is missing in the provided question,however the correct data set is provided with answer :
Answer:
Median value :
For males: 9.25
For females: 7.65
Explanation:
Median value is the value that separates higher half to lower half values and is the center point of values of the given set. The method of the finding the median is to arrange the set in order of least to highest value and then if the set of values are even than it is the mid point of the set and in the even set the mean of the middlemost values would be median of the set.
Arranging set in ascending order
For males: 4.5, 7.5, 9, 9, 9.2, 9.3, 10, 10, 10.5, 13.
For females: 5, 7, 7, 7.5, 7.5, 7.8, 7.8, 8, 8, 17
For males mean of the middlemost number is : 9.3+9.2/2 = 9.25
For females mean of the middlemost number is : 7.5+7.8/2 = 7.65
How much oxygen is consumed by fish species
Answer:
This is not generally realized but is vital when designing aeration systems for growing on warm water species. Most research indicates that trout consume around 200 – 250 mg O2/kg/hour. I regularly record carp consuming three times as much at 700- 800 mg/kg/hour under optimal growing conditions.
Explanation:
Answer: adult fish usually are between 200 and 500 mg oxygen
Select the correct answer.
Which term defines a well-tested, scientifically supported statement that explains how something works?
OA.
hypothesis
OB.
law
Ос.
observation
OD. theory
Reset
Next
What is a hypothesis?
Answer:
basically a guess that scientists make and can be proven right or wrong
Explanation:
Answer:
a guess
Explanation:
In order for a female fruit fly
to have white eyes, what
must be her genotype?
A. XR Xr
B. Xr Xr
C. XR XR
D. Xr Y
Answer:
B
Explanation:
I'm writing this to get 20+
All living things are made of matter- the smallest unit of: ____
Answer:
particles called cells
Explanation:
have a nice day and stay safe :}
You are building a race car.Your goal is to have a car that can go from 0 miles per house to 80 miles per hour in 2 seconds. You are focusing on the car’s?
-speed
-acceleration
-deceleration
-velocity
Answer:
acceleration
Explanation:
acceleration is the change in velocity in a given time. i also took the test and got it right, hope this helps :)
a physicist wants to measure the force required to push a heavy box up a ramp. what tools might the physicist use? what measurements should the physicist take?
Answer:
Flat surface and force applying body.
Explanation:
Flat surface and force applying body are the tools used by the physicist in order to know the amount of force required to push the body. Mass of the body and the acceleration produced from the application of force are the measurements recorded by the physicist. By multiplying value of mass and acceleration we can measure the amount force required to push the heavy box.
list the four main components of air in their molecular form
Answer:
Dry air is a mechanical mixture of nitrogen, oxygen, argon and several other gases in minor amounts.
Explanation:
The basic living unit of all plants and animals is a
O organelle
O organ
O cell
O chemical
Answer:
Cell
Explanation:
We humans are made up of cells and we produce that every second.
Answer:
Cell
Explanation:
Suppose that you and a friend see brightly colored pigeons like these at a nature park. Because pigeons are usually gray and white, you both wonder where these colors came from. Suddenly, your friend says, "I have a theory. These birds must get their colors from eating food that has the same colors."
Answer:
See the complete question and the answer below
Explanation:
Suppose that you and a friend see brightly colored pigeons like these at a nature park. Because pigeons are usually gray and white, you both wonder where these colors came from. Suddenly, your friend says, "I have a theory. These birds must get their colors from eating food that has the same colors."Is your friend's explanation a scientific theory? Give reasons to explain your answer
The answer is no. My friend's explanation is not a scientific theory.
A scientific theory is a tested and proven phenomenon. In order for a statement to become a theory, it must have been tested through experimentation by several independent researchers and found to be true. A mere statement based on perception with little or no experimental test is just a hypothesis and not a theory.
Instead of my friend to have said, "I have a theory", he should have said, "I have a hypothesis".
Tropical rain forests tend to have soils that are nutrient poor, and most of the nutrients are found in the top few inches of the soil.
Which adaptation is most likely found in tropical trees?
deep root systems
shallow root systems
needles
pine cones
Answer:
B)- shallow roots systems
Explanation:
cause it the ground is always wet.
thank you
Answer:
its B- shallow roots systems.
Explanation:
Hope it helps!
Have a great day :)
A researcher is studying the number and arrangement of fimbriae covering the surface of a bacterial cell. Which type of microscopy would be most useful for this purpose?
Answer:
The electron microscope
Explanation:
Fimbriae are very tiny appendages of about 3 to 10 nm in diameter found on the surface of most Gram-negative and some Gram-positive bacterial cells. They are mostly utilized as a structure to adhere to one another, to other organisms, or any other surfaces.
Fimbriae generally contain adhesins, a virulence factor that facilitates adhesion to surfaces and due to their tiny size, they can only be viewed using the electron microscope - the scanning electron microscope to be precise.
All living things must be able to___ ,it to make of their own kind
Answer:
reproduce
Explanation:
if not the specis will be extinct
What does the Big Bang theory suggest
Answer: The Big Bang theory basically explains how our universe began.
Our universe started with a small singularity, and inflated over the next 13.8 billion years to the cosmos we know
Please correct me if I’m wrong :)
Explanation:
What is on the inside (rungs)of the ladder?
Answer:
The rungs of the ladder or the steps are made up of the nitrogenous purine bases adenine and guanine as well as the nitrogenous pyrimidine bases thymine and cytosine. The rails on either side are alternating molecules of the sugar called deoxyribose and a phosphate.
Explanation:
Answer:
The rungs of the ladder or the steps are made up of the nitrogenous purine bases adenine and guanine as well as the nitrogenous pyrimidine bases thymine and cytosine. The rails on either side are alternating molecules of the sugar called deoxyribose and a phosphate.
what does an animal cell have
Answer:
Animal cells are typical of the eukaryotic cell , enclosed by a plasma membrane
and containing a membrane-bound nucleus and organelles. Unlike the eukaryotic
cells of plants and fungi, animal cells do not have a cell wall.
Please mark as brainliest
Answer:
Animal Cells contain many different things than plant cells one of them being the sell wall, In a animal cell it is a squishy membrane compared to the plant hard outer shell that acts as a skeleton.
Explanation:
Which phrase best defines erosion? cementing bits of rock together chemically breaking rocks apart moving bits of rock from place to place physically breaking rocks apart help pls
Answer:
chemically breaking rocks apart
Explanation:
First, lets talk about erosion:
Erosion is the process of eroding or being eroded by wind, water, or other natural agents.
Erosion can be either a fast process, or one that takes hundreds of years.
Water can fall in cracks of rock, later then freeze and expand causing to break rocks more.
Answer: Chemically breaking rocks apart.
Explanation:
Because erosion usually happens because of the flow of water. So the water has sand particles that hit the rock which breaks the rock.
Tall, light colored rock protruding from the ground, taller than surrounding trees. What type of rock is pictured here?
Answer:
Intrusive
Explanation:
Correct on Edge 2020
5 stars?
If this helped, please click the pink heart.
Answer:
Intrusive
Explanation:
becasue it is not on the earths surface
Two or more atoms held together by covalent bonds form a(n)
A. Ion
B. Molecule
C. Solution
D. Compound
The study of chemicals and bonds is called chemistry. when anything which can exist independently is called a molecule.
The correct answer to the question is option D that is compound.
Covalent bond?The bond which is formed by the sharing of electrons is called a covalent bond.Only metals and nonmetals form the covalent bond.According to the question, When Two or more atoms held together by covalent bonds form a compound.
Hence, the correct answer is option D.
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what's the answer a d please explain the claim,evidence and reasoning.
HELPPPPP MEEEEEEE!!!!!!!!!!!!!!!!!!!!!!!!!111
Answer:
Millimeters
Explanation:
Answer:
D
Explanation:
mm measures length in the smallest amount
What operation is used when simplifying fractions and conversion units?
Answer:
cancellation
Explanation:
A factor in the numerator is cancelled by dividing it by the same factor in the denominator. The quotient is 1, the multiplicative identity element.
╭☞ What operation is used when simplifying fractions and conversion units?
ANSWER:╭☞ Cancellation
Explanation: Because factor in the numerator is canceled by dividing it by the same factor in the denominator. The quienty is 1, the multiplicative element of the identity.For More Information:
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Choose the true statement. Prokaryotic cells are larger than eukaryotic cells . Prokaryotes have membrane-bound organelles. Prokaryotes have distinct nucleus. Prokaryotes are only single-celled.
Answer:
Prokaryotes are only Single Celled
Explanation:
A prokaryotes are single celled or unicellular organism that do not have nucleus or other membrane bound organelle.
Answer:
Prokaryotes are only Single Celled
Explanation:
Neurogenesis has been seen in the_____and in the_____.
A. temporal lobe ... hypothalamus
B. occipital lobe ... hippocampus
C. occipital lobe ... primary motor cortex
D. frontal lobe... somatosensory cortex
Answer:
olfactory bulb . . . hippocampus
Explanation:
Neurogenesis has been seen in the olfactory bulb and in the hippocampus. Thus, option B is correct.
What is Neurogenesis?During pre-natal development, new neural cells are formed in the brain by a process called neurogenesis.
The human brain is consist up billons of nerve cells are divided into neurons, glia, and an undetermined cell types.
In the early stage Neurogenesis, separation of neural plate from the ectoderm occur by a folding form called neural groove.
These neural groove fuse to form neural tube, a precursor to the central nervous system (CNS), and the neural crest.
The neural crest have stem cell property become differentiated into multiple leads to development of tissues and organs.
There are two regions in the brain known as the hippocampus and occipital lobe where neurogenesis are seen.
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