The first flying animals were _______, which first appeared in the _______ period.
A) birds; Carboniferous
B) birds; Cretaceous
C) bats; Jurassic
D) insects; Carboniferous
E) insects; Permian
Correct Answer:
Verified
Q40: During the Permian period, all of the
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Q48: Approximately _ species in the current biota
Q49: Approximately _ fossil species have been described.
A)
Q51: The period of time between when life
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Q53: Life first evolved on Earth _ years
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Q55: Abnormally high concentrations of _ have been
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