Which shows the steps of speciation in the correct order?
A) evolutionary changes, geographic isolation, reproductive isolation
B) genetic incompatibility, geographic isolation, evolutionary changes
C) geographic isolation, evolutionary changes, reproductive isolation
D) reproductive isolation, genetic incompatibility, geographic isolation
C
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Which condition is LEAST correlated with a decrease in atmospheric ozone?
a. more serious sunburns b. loss of ocean phytoplankton c. increased incidence of skin cancers d. decreased levels of atmospheric carbon dioxide e. increased occurrences of cataracts
Most reactions in the body occur too slowly to sustain life. This is because
A) there is not enough ATP in body cells. B) many reactions require large inputs of activation energy. C) no catalysts are present in body cells. D) all reactions in the body are endergonic. E) most biological catalysts are not active at body temperature (37°C).
Papillary muscles are attached to the cusps of valves by thin, strong connective tissue strings called
A. the chordae tendineae. B. the interventricular septa. C. the auricles. D. the interventricular sulcus. E. the coronary sinus.
Plants lacking well-developed conducting systems such as mosses, liverworts, and hornworts have been called
A. gametophytes. B. angiosperms. C. bryophytes. D. gymnosperms. E. sporophytes.