The __________ asteroid hypothesis proposes that
an asteroid impact led to the extinction of dinosaurs. Fill in the blank(s) with the appropriate word(s).
Answer: K-T
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The nervous system of vertebrates has how
many divisions?
a. 1 b. 2 c. 3 d. 4 e. variable, depending on the animal
Nematocysts are used for
a. reproduction. b. excretion. c. muscle action. d. circulation. e. defense.
What does Vibrio fischeri use to communicate?
A. Bioluminescence B. Physical contact C. Secreted chemicals D. Electrical impulses
Generally speaking, the difference-in-differences is defined to be the:
A. difference in the temporal change for the outcome between treated and untreated groups. B. difference in outcomes from random assignment. C. difference in outcomes from different treatment levels. D. None of the answers is correct.