Natural Selection UNIT REVIEW 8th Grade Mikos 2023

What is evolution?

• a. The loss of a species (a species dies out)
• b. The change of traits in a species over time
• c. The predation of one species on another species
• d. The conversion of a carnivore (meat eater) into an herbivore (plant eater)

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According to evolution, what happens to the frequency of traits in a population of species over time?

• a. The frequency of traits randomly changes
• b. The frequency of traits never changes
• c. The frequency of advantageous traits increases over time
• d. The frequency of advantageous traits decreases over time

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What is a common ancestor?

• a. A selective pressure that led the formation all the species on Earth
• b. An organism from which all organisms on Earth descended from
• c. An organism which all organisms on Earth strive to become
• d. An organism that lives on a different planet as well as Earth

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Which of the following is NOT a part of Darwin’s Theory of Natural Selection?

• a. There is little to no variation among the individuals in sexually reproducing species
• b. Individuals compete with each other for resources
• c. Competition can lead to death of individuals
• d. Individuals who survive are more likely to reproduce and pass traits to offspring

What is an adaptation?

• b. A favorable trait, which helps an organism survive
• c. An unfavorable trait, which is detrimental to the survival of an organism
• d. A characteristic that makes an organism “less fit”

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Which organisms are more likely to survive, reproduce and pass their traits to offspring?

• a. Organisms that are well-adapted to the environment
• b. Organisms that are not well-adapted to the environment
• c. Organisms that are less fit
• d. Organisms that reproduce very quickly

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What is a source of variation in a sexually reproducing species?

• a. Mutations
• b. Recombination
• c. Both a and b
• d. Neither a or b

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Which of the following is a resource that organisms compete for?

• a. Water
• b. Space
• c. Mates
• d. All of the above

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Why do organisms compete with each other for resources?

• a. There is an unlimited supply of resources
• b. There is a limited supply of resources
• c. Organisms produce more offspring than can survive
• d. Both b and c

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Fossils are an important piece of evidence for evolution because:

• a. They show that organisms have changed over time on Earth
• b. They demonstrate that organisms have become more complex
• c. They suggest there are similarities between ancient organisms and present organisms, suggesting that all living things are somehow related
• d. All of the above

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