Effects that are dependent on the size of the population and regulate the growth of populations are called ___________ effects.
A. K-related
B. density-independent
C. environmental resistance
D. density-dependent
E. demographic
D. density-dependent
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Which of the following correctly pairs a flower part with its function?
A) sepals â€" protect the flower bud B) petals â€" attract seed-dispersing animals C) the stigma â€" produces nectar D) the carpel â€" produces pollen
Which area is best known for its large effect of hydroperiod?
A) bottomlands B) prairie potholes C) fens D) bogs
Which cells can act as antigen-presenting cells?
A. helper T cells and cytotoxic T cells B. macrophages and helper T cells C. macrophages and B cells D. cytotoxic T cells and B cells
In human females, the ovarian cycle begins when the ________
A) levels of estrogen reach their maximum B) hypothalamus stimulates the anterior pituitary to increase its output of FSH and LH C) level of progesterone drops precipitously D) levels of FSH and LH drop precipitously