On the tree below,which number represents the most recent common ancestor of humans and corn? 
A) 1
B) 2
C) 3
D) 4
E) Humans and corn do not share any ancestors.
Correct Answer:
Verified
Q20: Which of these would be used to
Q21: Which CANNOT be accurately dated using radiometric
Q22: Which element has the longest half-life?
A) rubidium-87
B)
Q23: The half-life of carbon-14 is _ years.
A)
Q24: Which element has the shortest half-life?
A) rubidium-87
B)
Q26: A radioactive isotope is
A) a pair of
Q27: Which ratio is NOT analyzed for radiometric
Q28: An isotope is the same element with
Q29: How old is Earth?
A) 1-2 million years
Q30: Uranium-238 has a half-life of 4.5 billion
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