The set of blood vessels with the slowest velocity of blood flow is
A) the arteries.
B) the arterioles.
C) the metarterioles.
D) the capillaries.
E) the veins.
Ans: D) the capillaries.
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Any product of natural selection that increases the relative fitness of an organism in its environment is called a(n)
____.
a. neutral mutation b. adaptive trait c. founder effect d. speciation event e. polymorphic trait
How is variation in large natural populations possible? a. The presence of alleles in individuals
b. The presence of DNA in individuals. c. The presence of chromosomes in individuals. d. The presence of genes in individuals.
The flight muscles of insects:a
result in a heat-deficit problem for insects. b. contain more mitochondria than any known variety of muscle. c. only contract in direct response to stimulation by nerves. d. are capable of supporting flight under a wide range of cool, warm, and hot temperatures. e. can be insulated by feathers, scales, or fur.
How would decreasing the amount of raw material and keeping all other factors the same affect the human population?
A. It would increase the average life span of the human population. B. It would increase overpopulation. C. The problem of hunger would be decreased. D. Human carrying capacity would be decreased.