Extinction of existing species: group of answer choices
a. is an unconformity. occurred at a low level throughout geologic history.
b. occurred only at times of catastrophic mass extinctions.
c. occurred at a low level throughout geologic history, punctuated by mass extinctions when many types were killed over very short times.
d. is a process that happened in the past but cannot happen today.
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Extinction of existing species: group of answer choices
a. is an unconformity. occurred at a...
a. is an unconformity. occurred at a...
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