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.
E. Poorly adapted individuals never produce offspring.
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Based on the phylogenetic tree shown, which of the following is a correct statement of evolutionary relationships?
A. A snake is equally related to a bird and a crocodile. B. A snake is more closely related to a crocodile than to a turtle. C. A snake is more closely related to a crocodile than to a bird. D. A snake is more closely related to a bird than to a crocodile. E. A snake is more closely related to a frog than to a human.
In bog soils, the decomposition rate of lignin-cellulose complexes is accelerated by the water-logged, predominately anoxic conditions.
Answer the following statement true (T) or false (F)
Animals such as rabbits eat their own feces
a. False, this behavior is only seen in ruminants. b. True, this behavior is seen in many ruminants such as rabbits. c. False, however, this behavior can be observed in any malnourished animal. d. True, they can recapture some essential nutrients from their feces.
Multicelled, absorptive structures called __________ are on each fold of the small intestines. Fill in the blank(s) with the appropriate word(s)