According to kin selection, a man should die to save the life of
A. one full brother.
B. two half brothers.
C. four grandparents.
D. one parent.
E. nine cousins.
E. nine cousins.
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Which statement best describes the relationship between a carpel and a pistil?
A. The two terms are merely two names for the same thing. B. A pistil is part of a male component of the flower whereas a carpel is part of a female component. C. A pistil can be composed of either a single carpel (in which case the two terms are synonymous) or of two or more carpels fused together. D. A pistil is a reproductive part of a flower whereas a carpel is a showy vegetative part. E. A pistil is part of the female component of a flower and a carpel is not even a flower part at all.
A mild traumatic brain injury can ____
a. lead to a greater focus in concentration b. be metabolically beneficial c. lead to a depression in neuron excitability d. cause a contraction of brain tissue e. cause impaired short term memory
Skin contains
a. free neuron endings. b. encapsulated neuron endings. c. no nervous tissue. d. both a and b.
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.