In areas that have a stable population, the number of children born in a period of time is
A) decreasing.
B) lower than the number of adults.
C) higher than the number of adults.
D) increasing.
E) approximately equal to the number of adults.
E
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What percentage of the earth's atmosphere consists of nitrogen (N2) gas?
A. 0% B. 10% C. 28% D. 44% E. 78%
A behavior that can increase reproductive success of an individual male in a species is
A. All of the answer choices are correct. B. direct physical competition for the "right" to mate with a particular female. C. post-mating physical competition to block other males from subsequently mating with the female. D. the removal of the sperm from other males, so that there will be no successful fertilization. E. the ability to produce more sperm can be produced or released.
Kudzu is a vine that is native to Japan, but in the United States it is an exotic invader. In many parts of the United States, kudzu is rapidly expanding and outcompeting native species
Explain why kudzu is such an aggressive invader in the United States, but not in its native Japan.
In snapdragons, heterozygous plants have pink flowers, one of the homozygous conditions produces red flowers, and the other homozygous condition produces white flowers. When a parent plant with red flowers is crossed with a parent plant with white flowers, what percentage of the F1 offspring are expected to have pink flowers?
a) 75% b) 25% c) 0% d) 100% e) 50%