The greatest rate of extinction of all time is/was probably caused by ____

a. an ice age
b. unknown reasons
c. formation of Pangea
d. human activity
e. asteroid impact


D

Biology & Microbiology

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Indicate whether the statement is true or false.

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a. DNA polymerase b. DNA ligase c. helicase d. primase

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a. A. b. B. c. C. d. D. e. E.

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