Bat-pollinated, night-blooming flowers would most likely display which two characteristics?
a. blue petals and sticky pollen grains
b. yellow petals and the scent of rotting flesh
c. orange petals and no scent
d. white petals and a strongly sweet scent
e. red petals and sticky pollen grains
d
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Functions of the mantle in clams include
(a) secreting the shell. (b) forming pearls around irritating grains of sand. (c) forming the incurrent and excurrent siphons. (d) all of the above.
Populations rarely reach their biotic potential because ________
a. species cannot breed quickly enough b. the death rate always exceeds the birth rate c. there are limiting factors on population growth d. all of the choices
Which of the following is not an observation or inference on which natural selection is based?
A. Only a fraction of an individual's offspring may survive. B. Species produce more offspring than the environment can support. C. Individuals whose characteristics are best suited to the environment generally leave more offspring than those whose characteristics are less well suited. D. There is heritable variation among individuals. E. Poorly adapted individuals never produce offspring.
A graph that compares the relative number of individuals within different age groups of a population is called an age ________
Fill in the blank(s) with correct word