Among which of the following pairs of animals is competition likely to be most intense?
A. hummingbirds—honeybees
B. wolves—bison
C. grasshoppers—honeybees
D. mature white oak trees—young white oak trees
D. mature white oak trees—young white oak trees
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The upper respiratory tract usually has a considerable amount of resident microflora in a healthy adult
Indicate whether the statement is true or false.
Cell mediated immunity is mostly the function of
A. cytotoxic T cells. B. B cells. C. helper T cells. D. complement cells. E. mast cells.
__________, products of master genes, act as longrange
signals that diffuse out from a source and form a concentration gradient. Fill in the blank(s) with the appropriate word(s).
The gross reproductive rate is
A) the total number of offspring born to a population. B) the total number of offspring born to a population each year. C) the average number of female offspring born in a year. D) the average number of female offspring born to her over her lifetime.