Finding an abundance of iridium in the K–Pg boundary sequence worldwide pointed to evidence that this layer was of

____ origin.



a. carbon
b. organic
c. geologically recent


d. prehistoric
e. extraterrestrial


ANSWER: e

Biology & Microbiology

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a. 0.006 b. 0.06 c. 0.6

d. 1.6 e. 16

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A) stimulates seed germination. B) causes phototropism. C) promotes leaf and fruit drop. D) prevents leaf senescence. E) promotes gravitropism.

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