The first eukaryotic cells probably arose about ________ billion years ago.
A) 2.2
B) 2.5
C) 3.5
D) 4.5
Correct Answer:
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Q30: Fossils of prokaryotic cells are dated as
Q31: The Carboniferous Period is extremely significant to
Q32: Dinosaurs were the dominant group during the
Q33: Fossils from the Paleozoic are plentiful because
A)mammals
Q34: The oxygen in the atmosphere developed approximately
Q36: Africa,Asia,South America,and Antarctica share some patterns of
Q37: The first cells gave rise to
A)bacteria and
Q38: Which of the following major divisions of
Q39: The time that it takes for half
Q40: Mass extinctions
A)have occurred at least 5 times
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