The first eukaryotic cells probably arose about _____ billion years ago.
A) 1.5
B) 2.5
C) 3.5
D) 4.5
Correct Answer:
Verified
Q51: If the hypothesis that protocells were based
Q52: Our current understanding of the origin of
Q53: The alpha-helix is an example of the
Q54: Scientists once assumed that the earliest protocells
Q55: The most important of the energy-storing carbohydrate
Q57: Biological evolution differs from chemical evolution in
Q58: Which pairing of occurrence and date is
Q59: Heating dry mixtures of amino acids and
Q60: The Precambrian-Cambrian boundary is
A)a point that separates
Q61: A critical answer to the chicken-or-the-egg problem
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