Which of the following periods is the earliest during which animals may have appeared? a. Ordovician period b. Cambrian period c. Ediacaran period d. Cryogenian period
Which of the following periods is the earliest during which animals may have appeared? a. Ordovician period b. Cambrian period c. Ediacaran period d. Cryogenian period
Chapter18: Life's Origin And Early Evolution
Section: Chapter Questions
Problem 2SA: The first interval of Earths existence is called the ________. a. Cambrian c. Proterozoic eon b....
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Which of the following periods is the earliest during
which animals may have appeared?
a. Ordovician period
b. Cambrian period
c. Ediacaran period
d. Cryogenian period
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