A fossil is defined as any evidence of an organism from more than _____ years ago.
A) 10,000
B) 100,000
C) 1,000
D) 25,000
E) 500
Correct Answer:
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Q15: Relative dating uses _ to estimate how
Q16: In the geologic timescale used by our
Q17: Fossils may be
A) All of the answer
Q18: Potassium-40 is useful in determining the age
Q19: The Cretaceous and Jurassic periods are part
Q21: Marsupials are mammals that
A) carry their young
Q22: The femur in a snake and pelvis
Q23: If a structure has no apparent function
Q24: The half life of 14C is 5,730
Q25: Which of the following is least likely
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