_____ have a deep layer of humus-rish topsoil

a. Deserts c. Rain forests
b. Grasslands d. Seamounts


B

Biology & Microbiology

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Which is NOT a checkpoint in the cell cycle?

A. the transition from G1 to S phase B. the transition from G2 to M phase C. the transition from M phase to G1 D. the beginning of M phase E. All of these choices are checkpoints in the cell cycle.

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What is the function of normal biota of the respiratory tract?

A. Provides antibodies B. Microbial antagonism C. Competes with pathogens for resources and space D. Both [competes with pathogens for resources and space] and [microbial antagonism] are correct. E. All of these three functions are correct.

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Upon antigenic stimulation, CD8+ T cells differentiate into helper T cells

Indicate whether the statement is true or false.

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What is a cost to the female in a polygynous mating system?

A. little opportunity to mate with a genetically fit male B. high risk of contracting sexually transmitted diseases C. little help from male in caring for offspring D. high competition between females for access to males

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