The earliest signs of life 4.1 billion years ago exist in
A) fossilized bacterial mats called stromatolites.
B) isotopic signatures of zircons.
C) biomarkers from pigmented bacteria.
D) all of the above
Correct Answer:
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Q67: Describe an example fossils being used to
Q68: Zircons are
A) tiny specks of carbon preserved
Q69: Explain how carbon isotopic signatures can be
Q70: Which of the following is a behavior
Q71: The earliest hints of terrestrial life come
Q73: Which of the following may have been
Q74: Give one explanation that has been proposed
Q75: We are currently in the _ epoch,
Q76: Describe one advantage that carbon dating provides
Q77: An isotope's half-life is
A) the amount of
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