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Natural Selection and Adaptation Practice Tests

These Grade 8 Science practice tests cover inherited variation, mutations, natural selection, fitness, environmental pressures, adaptations, artificial selection, common ancestry, population change, and evidence from DNA, fossils, anatomy, and geography.

Skills covered

  • Connecting inherited variation to survival and reproductive success
  • Explaining how environmental pressures change trait frequencies in populations
  • Distinguishing individual responses from population-level evolution
  • Using fossils, DNA, anatomy, and biogeography as evolutionary evidence
  • Interpreting graphs, models, investigations, and adaptation examples

How to use these practice tests

Identify the population, inherited trait, environmental condition, and reproductive outcome in each question. Then decide whether the evidence supports natural selection, adaptation, common ancestry, or another population process.

For more Grade 8 Science practice, return to the Grade 8 Science category.

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Grade 8 Natural Selection and Adaptation Practice Tests

Practice Grade 8 Science questions about inherited variation, natural selection, adaptations, common ancestry, population change, and evolutionary evidence.

Choose the best answer. Identify inherited variation, environmental pressures, population changes, and the evidence that supports each conclusion.

10 Questions
0/10 Questions0 %
Correct 0
Incorrect 0
Unanswered 10
1. QuestionMultiple choice

What can homologous structures suggest about different species?

Please select an answer first.

Correct answer: A

The correct answer is They may have inherited the structures from a common ancestor..

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: Similar underlying structures with different functions can be evidence of common ancestry.
  3. Check the population result: The correct choice is They may have inherited the structures from a common ancestor..

Similar underlying structures with different functions can be evidence of common ancestry.

2. QuestionMultiple choice

What can similarities in DNA sequences show?

Please select an answer first.

Correct answer: B

The correct answer is Species with more similar sequences may share a more recent common ancestor..

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: Comparing DNA provides molecular evidence that can help scientists infer evolutionary relationships.
  3. Check the population result: The correct choice is Species with more similar sequences may share a more recent common ancestor..

Comparing DNA provides molecular evidence that can help scientists infer evolutionary relationships.

3. QuestionMultiple choice

What is geographic isolation?

Please select an answer first.

Correct answer: C

The correct answer is A physical separation that prevents populations from regularly interbreeding.

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: Mountains, islands, rivers, or other barriers can separate populations and reduce gene flow.
  3. Check the population result: The correct choice is A physical separation that prevents populations from regularly interbreeding.

Mountains, islands, rivers, or other barriers can separate populations and reduce gene flow.

4. QuestionMultiple choice

How can geographic isolation contribute to speciation?

Please select an answer first.

Correct answer: D

The correct answer is Separated populations can accumulate differences until they no longer interbreed successfully..

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: Over many generations, mutation, selection, and genetic drift can make isolated populations reproductively different.
  3. Check the population result: The correct choice is Separated populations can accumulate differences until they no longer interbreed successfully..

Over many generations, mutation, selection, and genetic drift can make isolated populations reproductively different.

5. QuestionMultiple choice

What does the fossil record show when related organisms appear in a sequence of changing forms?

Please select an answer first.

Correct answer: A

The correct answer is It can provide evidence that populations changed over long periods..

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: Fossil sequences can reveal changes in form and distribution through geological time.
  3. Check the population result: The correct choice is It can provide evidence that populations changed over long periods..

Fossil sequences can reveal changes in form and distribution through geological time.

6. QuestionMultiple choice

What do vestigial structures sometimes indicate?

Please select an answer first.

Correct answer: B

The correct answer is A structure may have been inherited from an ancestor where it had a larger or different function..

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: A reduced structure can reflect evolutionary history even when it no longer performs the original function.
  3. Check the population result: The correct choice is A structure may have been inherited from an ancestor where it had a larger or different function..

A reduced structure can reflect evolutionary history even when it no longer performs the original function.

7. QuestionMultiple choice

Why can embryonic similarities be evidence of relatedness?

Please select an answer first.

Correct answer: C

The correct answer is Similar early development can reflect shared inherited developmental pathways..

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: Patterns in early development can provide another line of evidence for common ancestry.
  3. Check the population result: The correct choice is Similar early development can reflect shared inherited developmental pathways..

Patterns in early development can provide another line of evidence for common ancestry.

8. QuestionMultiple choice

What does reproductive isolation mean?

Please select an answer first.

Correct answer: D

The correct answer is Populations cannot successfully produce fertile offspring together..

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: Reproductive isolation prevents gene flow and can allow separated populations to become distinct species.
  3. Check the population result: The correct choice is Populations cannot successfully produce fertile offspring together..

Reproductive isolation prevents gene flow and can allow separated populations to become distinct species.

9. QuestionMultiple choice

Why does a branching evolutionary tree show common ancestry?

Please select an answer first.

Correct answer: A

The correct answer is A branch point represents a population that split into lineages..

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: Branching diagrams model how lineages diverge from shared ancestors over time.
  3. Check the population result: The correct choice is A branch point represents a population that split into lineages..

Branching diagrams model how lineages diverge from shared ancestors over time.

10. QuestionMultiple choice

What can biogeography study?

Please select an answer first.

Correct answer: B

The correct answer is The distribution of organisms across places and how geography relates to their evolution.

  1. Identify the population and trait: Determine which inherited variation, environmental condition, or reproductive pattern is being described.
  2. Connect the evidence to selection: The geographic distribution of species can reveal isolation, migration, and shared evolutionary history.
  3. Check the population result: The correct choice is The distribution of organisms across places and how geography relates to their evolution.

The geographic distribution of species can reveal isolation, migration, and shared evolutionary history.

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