The sediment at the lake bottom is the _____ zone.
A. littoral
B. limnetic
C. profundal
D. benthic
E. pelagic
D. benthic
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Which of the following must exist in a population before natural selection can act upon that population?
A. variation among individuals in reproductive success B. genetic variation among individuals C. sexual reproduction D. Three of the responses are correct. E. Two of the responses are correct.
The inability of a man to produce LH would result in
A. the inability of Leydig cells to produce testosterone. B. the inability of the pituitary to produce FSH. C. the loss of positive feedback control on GnRH release. D. the degeneration of the male reproductive tract. E. feminization of the testes.
As mussels and barnacles feed, how much of the energy that they take in from food is
available to the whelks that eat them?
a. 10 percent b. 90 percent c. 1000 calories d. 10,000 calories
The nucleus separates the chromosomes from the rest of the cell. How is the information in the DNA communicated to the cell?
What will be an ideal response?