Studies have demonstrated that in some cases, female marathon runners don't exhibit a normal menstrual cycle. What fact could explain this condition in female runners?
A) The women have too much body fat.
B) The women have low levels of growth hormone.
C) The women release too much testosterone.
D) The women do not have enough body fat.
D
Biology & Microbiology
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The phenotypic trait that selection acts upon directly is referred to as the ________ of selection
Fill in the blank(s) with correct word
Biology & Microbiology
What produces gene flow?
A) mating between populations B) geographical isolation C) mutation D) speciation
Biology & Microbiology
Glial cells support and nourish neurons
____________________ Indicate whether the statement is true or false.
Biology & Microbiology
Which of the following factors DOES NOT influence the degree of killing of microorganisms?
A. Concentration of disinfecting agent B. type of organisms C. number of organisms present D. oxygen content of the environment
Biology & Microbiology