The Permian mass extinction is associated with ________
A) an asteroid impact
B) global warming
C) the formation of Pangaea
D) the diversification of mammals
C
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Helicobacter pylori is, in part, able to survive in the stomach by its ability to produce
A. lactic acid from sugar. B. fatty acids from sebum. C. neutralizing proteins from glucans. D. ammonia from urea.
Why are veins less elastic than arteries?
What will be an ideal response?
Ginkgo trees are known to lose their leaves at a certain time each year throughout the United States. Based on this information, Ginkgo trees in China must behave the same way. These statements are an example of:
A. inductive reasoning B. a theory C. an experiment D. deductive reasoning
The oxygen (O2) produced by photosynthesis comes from carbon dioxide (CO2).
a. true b. false