8th Grade Science : Life Science

Study concepts, example questions & explanations for 8th Grade Science

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Example Questions

Example Question #1 : Life Science

What is the process that enables organisms that are best suited for the environment to live and pass on their genetic traits. 

Possible Answers:

Evolution 

Mutation 

Environmental Selection 

Natural Selection 

Correct answer:

Natural Selection 

Explanation:

Natural Selection is the process that enables organisms that are best suited for the environment to live and pass on their genetic traits. 

Example Question #2 : Life Science

What is characterized as a mistake or change in an organism's DNA? 

Possible Answers:

Environmental Selection 

Mutation 

Evolution 

Natural Selection 

Correct answer:

Mutation 

Explanation:

A mutation is characterized as a mistake or change in an organism's DNA.

Example Question #3 : Life Science

Fill in the blank: 

When a species becomes better suited to its environment, it's said that the species has __________. 

Possible Answers:

adapted 

grown

mutated 

evaporated 

Correct answer:

adapted 

Explanation:

Adaptation is the processes in which a species becomes better suited to its environment; thus, the correct answer is adapted. 

When a species becomes better suited to its environment, it's said that the species has adapted. 

Example Question #2 : Life Science

Select the option that is not a cause of extinction. 

Possible Answers:

Deforestation 

All options are correct 

Agriculture 

Habitat Fragmentation 

Correct answer:

All options are correct 

Explanation:

There are many causes of extinction. Agriculture, habitat fragmentation, and deforestations are all causes of extinction. 

Agriculture causes extinction by emitting toxins into the environment.

Habitat fragmentation causes extinction by changing an animals habitat. Usually, habitat fragmentation is caused by development breaking apart an animal's habitat. 

Deforestation causes extinction by taking away animals's habitats. Deforestation is when forests are cut down. 

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