_____ have a deep layer of humus-rish topsoil
a. Deserts c. Rain forests
b. Grasslands d. Seamounts
B
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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.
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.
Upon antigenic stimulation, CD8+ T cells differentiate into helper T cells
Indicate whether the statement is true or false.
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