What are some advantages and disadvantages of natural selection

Answers

Answer 1

Answer: natural selection eliminates aniamals that might be nessisary to life but it would hepl other animals survive as food for them

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Glaciers pick up large rocks and carry them away. This is called _____.hydraulic action

traction

plucking

attrition

Answers

Answer: plucking

Plucking is a type of glacier erosion.Plucking occurs when the ice around the broken rocks, gets displaced with the force exerted by the retreating glacier. The glacier ice plucks the freezed rocks away along with it during glacier erosion.

Answer:

plucking

Explanation:

took the test and it was correct

Kevin has his mother’s blue eyes and her shyness, which can both be attributed to __________.a. habits
b. heredity
c. environment
d. culture

Answers

the answer is B. Heredity

The correct answer would be heredity. As Kevin was getting his genes - Blue eyes are usually less likely to brown eyes in the equation. Anyway, if Kevin's mother had a very strong gene for the blue eyes dna strand , then Kevin would get the blue eyes. As Kevin was growing up, he most likely tried to be like a familiar figure. Which in this situation is his mother.

Which one of the following statements accurately describes a characteristic of red blood cells?

Answers

They transport oxygen to all the cells of the body!

DDT was widely used as a pesticide for 20 years. Its use was banned after studies showed severe side effects were evident in humans, the environment, and animals as a result of DDT. Why were the side effects of DDT so harmful?A. DDT kills insects and other pests.
B. DDT decomposes.
C. DDT was genetically engineered.
D. DDT bioaccumulates.

Answers

Out of the choices given, the side effects of DDT were so harmful because of the DDT bioaccumulates. The correct answer is D.

Answer: D. DDT bioaccumulates

Bioaccumulation is the accumulation of substances or compounds such as pesticides, fertilizers or other chemicals in the body of the organisms. These substances or compounds are toxic and remain undigested in the body of the organisms are transferred subsequently in a food chain, when one organism is consumed by another organism. The highest trophic level is most effected because of the concentration of the toxic substance is the maximum.

DDT (dichlorodiphenyltrichloroethane) is a colorless, odorless and tasteless crystalline chemical compound. It is used as a pesticide to kill pests in agricultural field. DDT is highly toxic chemical compound. It remains undigested in the body of the organism and transferred in a food chain when one organism is consumed by another organism. The effect of DDT is magnified several times in the top most trophic level in the food chain due to bioaccumulation.

Which one of the following accurately describes the reactions within photosynthesis? A. The light-independent reactions use ATP and NADPH.
(B.) The light-independent reactions are responsible for making ATP and NADPH. C. The light-independent reactions use the sunlight to drive its processes.
D. The light-dependent reactions are responsible for making sugars.

I put B but it was wrong.

Answers

It's probably C. Because it makes the most sense and photosynthesis doesn't make ATP and if you don't think C. Is the answer then put D.

Answer:

The light-independent reactions use the sunlight to drive its processes.

Explanation:

This the true statement, because in photosynthesis processes, sunlight is needed to processes happen.

Remember that photosynthesis is a chemical reaction to produce food for the plants. This process take place in the leaves. Also, to this process happen is needed sunlight, water and carbon dioxide.

Choose the definition of: InvertebratesA. Having no backbone
B. have a backbone
C. having several backbones
D. having lost a backbone

Answers

The correct option is (a) having no backbone.

Invertebrates are the category of organisms that lack backbone. They have some soft tissues and because of this their body is soft as compared to that of vertebrates. Example: jellyfish and sponges. Some of the invertebrates have outer covering which is very hard called as exoskeleton. This helps them to protect from outer injuries and harsh conditions. Example: cockroach, spiders, etc.

without backbone or having no backbone is considered as INVERTEBRATES.

hope its help...

--kcirejay:♥)

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