Nitrogen-fixing bacteria convert ____ to ____, which is a form of nitrogen that plants can use.
A. nitrogen gas; ammonia
B. ammonia; nitrogen gas
C. nitrogen gas; nitrates
D. nitrogen gas; nitrites
E. ammonia; nitrates
Answer: A
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How many Barr bodies would one expect to see in cells of Turner syndrome females and Klinefelter syndrome males?
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A possible answer to a research question asked by a scientist is referred to as a ________
concept theory hypothesis law