1. Review Quiz 3
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2. What is a mutation?
A. Something caused by exposure to toxic substances
B. Random changes in DNA molecules of a gene in any cell which can result in a new genetic trait
C. Changes in DNA that cause an individual to become disadvantaged and probably go extinct

3. Correct!
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4. Incorrect!
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5. Why are insects important?
A. They are food for other organisms and help control other pests
B. They provide pollination and soil conditioning
C. Both A. and B.

6. Correct!
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7. Incorrect!
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8. What is a biological evolution?
A. Mutations that allow organisms to survive
B. Immediate changes in DNA through genetic engineering
C. Process whereby Earth’s life changes over time through changes in the genetic characteristics of populations

9. Correct!
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10. Incorrect!
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11. What is an adaptation?
A. Any heritable trait that improves the ability of an individual organism to survive and reproduce at a higher rate than others in a population
B. A mutation that allows an individual to reproduce within a population
C. Random change in the DNA of any gene or cell

12. Correct!
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13. Incorrect!
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14. What is speciation?
When one group leaves a population to form two or more species
B. When one species splits into two or more different species
C. The number of species present in an ecosystem

15. Correct!
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17. What is geographic isolation?
A. When an earthquake happens and splits a herd of animals apart
B. When animals are taken away from each other by humans to live in different parts of the world
C. When different groups of the same population of a species are physically isolated from one another for a long period of time

18. Correct!
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20. What is an ecological niche?
A. The home that an organism lives in
B. The role that a species plays in its ecosystem
C. The food that an organism eats

21. Correct!
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23. What is an extinction?
A. Species that are so rare that we aren’t sure that they exist
B. When a meteor hits the Earth and kills all the animals
C. When an entire species ceases to exist globally or over a large region

24. Correct!
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25. Incorrect!
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