What unit is isotopic fractionation reported as?

A) parts per billion
B) parts per million
C) parts per thousand
D) parts per trillion


Answer: C

Biology & Microbiology

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This example represents what type of competition?

a. intraspecific b. interspecific

Biology & Microbiology

Endergonic reactions require the ______ of energy, while exergonic reactions ______ energy.

a. release; input b. input; release c. output; input d. creation; destruction

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The primitive Earth's atmosphere did NOT contain

a. free oxygen. b. free nitrogen. c. free hydrogen. d. water vapor. e. inert gases.

Biology & Microbiology

Bacterial cells that are variable in shape are called ________.

A. hyphal B. coccobacilli C. pleomorphic D. vibrio

Biology & Microbiology