In which of the following biological systems

have radioactive tracers been used?



a. cells
b. bodies
c. ecosystems
d. all of these
e. all of these except ecosystems


D

Biology & Microbiology

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A. true B. false

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a. True b. False

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Plants first colonized the land during the Mesozoic Era

a. true b. false

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All amphibians must return to the water to 

A. feed. B. breathe. C. reproduce. D. All of these answers are true.

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