7th grade science questions
How do living creatures produce light?
Describe two ways that bioluminescence is useful to the firefly?
How have coal miners made use of bioluminescence?
Rudolph is famous for his glowing red nose
What could possibly make his nose emit light?
Why would the glow of his nose be red?
Please don't answer just for points, I need this to be done by today! Thank you for your time.
Answer:
Bioluminescence is the production and emission of light by a living organism
Explanation:
Bioluminescence occurs through a chemical reaction that produces light energy within an organism's body. For a reaction to occur, a species must contain luciferin, a molecule that, when it reacts with oxygen, produces light. ... Many organisms also produce the catalyst luciferase, which helps to speed up the reaction.
Help please anyone please!!!!
Answer:
The answer is A Carrying capacity.
Explanation:
Which of the following are examples of autotrophs/ producers? Select all that apply,
Birds
Trees
Algae
Cactus
Deer
three complex carbohydrates, the subunits of glucose are bonded together differently. Because they have different structures, they most likely-
a- from different proteins
b- carry different nucleotides
c- contain different chemical elements
d- perform different functions
Name two cell structures plant cells have that animals do not have and one structure that looks very different in a plant and animal cell (think size).
Answer:
Plant cells have a cell wall and chloroplasts and the cell wall gives the cell a rectangular shape unlike animal cells which have a round shape because we only have a cell membrane.
Answer:
plant cells have a cell wall . animals do not have and one structure that looks very different in a plant and animal cell
Explanation:
How do the circulatory and respiratory systems deliver important
substances?
Answer:
Gas exchange between tissues and the blood is an essential function of the circulatory system. In humans, other mammals, and birds, blood absorbs oxygen and releases carbon dioxide in the lungs. Thus the circulatory and respiratory system, whose function is to obtain oxygen and discharge carbon dioxide, work in tandem.
What did the Ancient Greek and Romans use to magnify objects?
Answer:
They used clear glass
Explanation:
Answer:
Most ancient lenses are convex and were used to magnify. At Carthage there are 14 glass lenses and two of rock crystal stored in a drawer in the museum; they have apparently never been displayed.
Explanation:
A male cardinal’s red color is an example of a trait affected by natural selection. The females of the species choose mates based on the vibrant colors of the males’ feathers. If females begin using different criteria than feather color when they choose mates, what would most likely happen to the color of the male cardinals over time?
increased variation in the shades of red because there is no advantage in one specific color
increased variation in the shades of red because the cardinals try different ways to impress the females
decreased variation in the shades of red over time because no form of the trait is advantageous
decreased variation in the shades of red after a single generation
Answer:
decreased variation in the shades of red over time because no form of the trait is advantageous
Explanation:
If the vibrant red feathers are no longer used to attract mates, then it is no longer useful to the males, so it will cease to exist.
Answer:
C. decreased variation in the shades of red over time because no form of the trait is advantageous
the light-collecting units of a chloroplast are the
Answer:
Thylakoids
Explanation:
proteins in the thylakoid membrane organize chlorophyll and other pigments into clusters known as photosystems. And are the light-collecting units of the chlorophast.
Transcribe the strand of DNA CTA AGG TAG
HELP!!!!15 POINTS!!!!!!
i think it's f but idk..
Answer:
F is good
Explanation:
The union of a sperm and an egg during the life cycle of a jellyfish is best described as
a
b
ОООО
sexual reproduction
genetic inheritance.
asexual reproduction,
genetic engineering,
d
Answer:
Sexual reproduction and asexual reproduction
Explanation:
this is because the jellyfish takes on two different body forms that is medusa and polyps. polyps produce asexually by budding while medusa pawn eggs and sperm to produce sexually
Can a
Brain cell
Fat cell
Muscle cell
Red blood cell
Liver cell
Convert one type of fuel molecule to another
answer: yes
exanation:
3. Convection is the transfer of heat through the
rising and sinking of a fluid. A student is
constructing an explanation for how convection
currents form in the mantle. Which statement
would be most useful for the student to include in
the explanation?
A. Earth's temperatures increase with
.
depth.
B. The mantle is the thickest of Earth's
four main layers.
OC. The mantle contains gases mixed with
rock.
D. Temperatures are about the same
throughout the mantle.
Which of the following solutions would have solute concentration that is lower than the concentration found inside the cell
Answer:
hypotonic solution
A hypotonic solution has a lower solute concentration than inside the cell (the prefix hypo is Latin for under or below). The difference in concentration between the compartments causes water to enter the cell.
Thank you and please rate me as brainliest as it will help me to level up
Answer:
A. Hypotonic Solution
Most fossils are dug up from sedimentary rock layers. Small pieces of an animal's remains become squeezed between the layers of this sediment. Over long periods of time, they are buried under more and more layers of sediment that piles up on top of it.
True or False?
- Lee el siguiente párrafo y a continuación responde lo que se te pide.Los seres humanos primitivos comenzaron a clasificar las plantas y los animales tanto por su utilidad como por el daño que les causaban, luego fueron profundizando aún más en sus conocimientos sobre la flora y la fauna de su entorno, identificando los ciclos biológicos y hábitat, entre otros aspectos que facilitaron su producción y pronta disponibilidad. Con base en el párrafo anterior se puede afirmar que: * 1 punto A) Empezaron a entablar una relación más estrecha con el medio ambiente. B) Abandonaron su vida primitiva y nómada C) Incrementaron sus conocimientos únicamente sobre el ciclo del agua. D) Empezaron la agricultura y la piscicultura.
Answer:
A) Empezaron a entablar una relación más estrecha con el medio ambiente.
Explanation:
Desde el pasaje, podemos ver que la gente comenzó a prestar más atención a su entorno y cómo la fauna y la flora afectan la vida humana.
Incluso intentaron desarrollar un sistema burdo de clasificación biológica. Henec, se puede inferir que las personas desarrollaron una relación más cercana con su entorno.
What are renewable resources?Provide examples.
Answer:
Energy that comes from a natural "renewable" source or processes that are constantly replenished
Explanation:
Examples could be solar energy, wind energy and hydro energy. Each come from a natural resource.
30 Points will give brainliest
Which of the following statements is true according to the food web shown above?
A.
Energy flows directly from the Sun to consumers.
B.
Energy flows from consumers to decomposers and from decomposers to consumers.
C.
Energy flows from producers, consumers, and decomposers to the Sun.
D.
Energy flows from producers and consumers to decomposers.
Answer:
the answer to this question is b
Answer:
D
Explanation:
I hope this is correct and have a great day
A phagocytic cell engulfs a bacterium. This process is known as....
A endoplasmosis
B exocytosis
C passive transport
D endocytosis
Answer:
D endocytosis
Explanation:
I just found it it's called phagocytosis which is a process of endocytosis
A scientist discovers a new type of eukaryotic cell that does not contain mitochondria. As a result of this difference, the scientist predicts that the cell is most likely to be different from other eukaryotic cells in which way? A.In the way it releases energy from food molecules B.In the way it maintains homeostasis with its environment C.In the way it reproduces D.In the way it evolves
Answer:
A. In the way it releases energy from food molecules
Explanation:
This is because, the mitochondria is the part of the cell that produces energy from food molecules. Since this cell does not contain a mitochondria, it will thus affect the way it releases energy from food molecules.
Man has a haploid life cycle.
True
False
Man does not have a haploid life cycle. Haploid life cycle is observed in most of the single-celled organisms. Thus, the given statement is false.
What is haploid life cycle?
The haploid life cycle is the simplest type of life cycle. It is found in most of the single-celled eukaryotic organisms. Organisms with a haploid life cycle spend the majority of their lives in haploid forms as haploid gametes. When these haploid gametes fuse, they form a diploid zygote.
The life cycle of Man is an example of diploid life cycle. The human life cycle involves a mature human cell (2n), eggs are produced by meiosis in the ovary of a woman, and sperms are produced by meiosis in the testis of a man. The eggs and sperm combine in fertilization to form a diploid zygote (2n).
Learn more about Haploid life cycle here:
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CAN SOMEONE PLEASE HELP MEE !!!!!! This is my second time posting this I really need your help.
The graph represents the outcome of natural selection in a population of Darwin's finches. Which statement best describes this outcome?
A) Finches that are best suited to survive and reproduce (points 1 and 3) are more likely to pass on beneficial traits to their offspring; those less suited (point 2) fail to pass on their traits to their offspring.
B) Finches that are least suited to survive and reproduce (points 1 and 3) are more likely to pass on beneficial traits to their offspring; those more suited (point 2) fail to pass on their traits to their offspring.
C) Finches that are best suited to survive and reproduce (point 2) are more likely to pass on beneficial traits to their offspring; those less suited (points 1 and 3) fail to pass on their traits to their offspring.
D) Finches that are least suited to survive and reproduce (point 2) are more likely to pass on beneficial traits to their offspring; those more suited (points 1 and 3) fail to pass on their traits to their offspring.
Answer:
B) Finches that are least suited to survive and reproduce (points 1 and 3) are more likely to pass on beneficial traits to their offspring; those more suited (point 2) fail to pass on their traits to their offspring.
Explanation:
I think . If it is wrong I am truly sorry.
I'll give you a brainliest if is right or at least shows some effort
(thanks & i hope your having a good day)
In your own words, explain how stalagmites are formed in caves.
Explanation:
As the redeposited minerals build up after countless water drops, a stalactite is formed. If the water that drops to the floor of the cave still has some dissolved calcite in it, it can deposit more dissolved calcite there, forming a stalagmite. Speleothems form at varying rates as calcite crystals build up.I WILL GIVE BRAINLIEST Using the information above and details from your research, write a paragraph of five sentences or more explaining how microwaves uses the behavior and characteristics of the electromagnetic wave to function.
Answer:
A microwave uses the behavior and characteristics of the electromagnetic wave to function. A microwave is an electromagnetic wave with a quite long wavelength and low frequency. Microwaves are often called radio waves, but they have higher frequencies than other radio waves. With higher frequencies, they also have more energy. That's why microwaves are useful for heating food in microwave ovens.
Explanation:
Boom, drop the mic.
1. Which of these decreases as we
move from summer to winter?
O the amount of photosynthesis
occuring
O vegetation
O food supplies
all of these
Answer:
I believe the answer is All of them. But I'm not 100% sure.
What causes changes in cells?
Answer:
their are two electric and body cells which is body building blocks of life which
a bowling ball hitting pins and they fly backwards whicch
Newton’s law
Answer:
3rd. Every action has the same and equal reaction
Explanation:
Answer: 1st Newton Law.
Explanation:
Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.
Monthly trash removal cost is increasing by 25% this month. If the current cost is $300, what will the new monthly cost be?
will yall please help me (agriculture)
How is the changing environmental quality posing a challenge to agricultural industries?
Soil polluted with heavy metals causes crops to grow more quickly.
Higher birth rates in livestock are due to land pollution.
Water and land pollution make it more difficult to grow healthy crops and livestock.
Droughts cause more people to move to rural areas.
Answer:
Agricultural activities that cause NPS pollution include poorly located or managed animal feeding operations; overgrazing; plowing too often or at the wrong time; and improper, excessive, or poorly timed application of pesticides, irrigation water, and fertilizer. Industrial farming practices, such as monocropping and intensive tillage, have also compromised soil health over time. ... Excessive fertilizer use can also cause a buildup of salts in soil, heavy metal contamination and accumulation of nitrate (which is a source of water pollution and also harmful to humans
Explanation:
However agriculture is both cause and victim of water pollution. It is a cause through its discharge of pollutants and sediment to surface and/or groundwater, through net loss of soil by poor agricultural practices, and through salinization and waterlogging of irrigated land.