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| By studying __, scientists have learned that man species have become extinct, but many new species have appeared. |
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| It is estimated that over 99% of all species that ever lived have gone __, and because of pollution and habitat destruction caused by people, one-half of all species of life on earth will be __in 100 years. |
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| All species are constantly undergoing the process of __. |
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| The __ explains why today’s species are different than their ancestors in both physical makeup and in behavior. |
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| According to the fossil record and the theory of evolution, our closest __ were not too unlike what we are now in physical makeup and in behavior, but our distant ancestors were very different than we are like today. |
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