Changes Over Time

Over generations, populations of anteaters have developed longer tongues. Why might such a change occur?

• Long tongues help anteaters escape from predators

• Anteaters with long tongues require less food than anteaters with short tongues

• Anteaters with long tongues can reach food sources other animals cannot

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Darwin observed & recorded data about many species of finches. According to Darwin, how did the food source on each island affect how the birds evolved?

• Birds brought their favorite food with them to the island

• Birds with beaks adapted to the food source on the island, survived and reproduced

• Birds changed food sources on the island to match their beak

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All of the following are evidence of evolution EXCEPT for:

• different genes

• homologous structures

• Similar developmental patterns (embryonic development)

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Darwin's idea about how evolution occurs is called

• variation

• natural selection

• adaptation

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Organisms evolve due to changes in their DNA called

• photosynthesis

• cellular respiration

• mutations

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Who was the Scientist most famous for his study of natural selection and evolution?

• Theodor Schwann

• Robert Hooke

• Charles Darwin

• Rudolf Virchow

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What is the process in which populations CHANGE gradually over time?

• evolution

• species

• variation

• competition

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How do scientists use embryology to support the theory of evolution?

• Embryos of many species have a lot of similar characteristics when they are first forming showing different creatures must have a common ancestor

• Embryos of many species have very little in common until they start developing for long periods of time

• Features like gills and tails prove that all animals are really just fish

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The theory that organisms have slowly changed over time...

• fossil record

• relative dating

• evolution

• adaptation

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What do you call a characteristic that allows an organism to survive in an environment?

• variation

• adaptation

• selection

• overproduction

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