Which of the following is not part of Darwin's mechanism of evolution?
a. overproduction of offspring
b. competition among organisms
c. acquiring traits because they are needed
d. differential reproductive success
e. genetic variation among individuals
C
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In a neuron at rest, the membrane is most permeable to
A. potassium. B. sodium. C. chloride. D. calcium. E. magnesium.
Burning fossil fuels has clearly resulted in
a. increases in atmospheric concentrations of carbon dioxide. b. increases in extinction rates. c. increases in concentrations of carbon dioxide in soils. d. increases of carbon retention in species. e. decreases in atmospheric concentrations of oxygen.
Which type of epithelial tissue lines the blood vessels and the heart?
a. simple cuboidal b. complex cuboidal c. simple squamous d. simple columnar e. stratified cuboidal
Which of the following describes an evolutionary arms race?
a. predator–prey population dynamics in lynx and snowshoe hares b. the adaptation of apple maggot flies life cycle timing to the fruiting time of apple following a host shift from late fruiting hawthorn to early fruiting apple c. the adaptation to climate change by mosquitoes that live in pitcher plants d. the evolution of toxicity in rough-skinned newts and the evolution of newt poison detoxifica-tion in its garter snake predator