Many new species of desert lizards have arisen from a nonnative population which was introduced into the American
southwest. This example best describes:a.
the effects of climatic change.
b. sympatric speciation.
c. allopatric speciation.
d. adaptive radiation.
e. microevolution.
d
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Which tissues are correctly matched to their progenitor germ layer? (Check all that apply.)
_____ ectoderm—lining of the digestive tract _____ ectoderm—epidermis _____ endoderm—lining of the respiratory tract _____ endoderm—muscles _____ mesoderm—blood vessels _____ mesoderm—gonads
Cellular respiration is essential to eukaryotic cells because
A) it is a process of anabolic reactions necessary for DNA synthesis. B) it breaks down ATP molecules into ADP and a phosphate. C) the process releases energy from organic substrates. D) it releases energy from anabolic reactions, which then can be used to drive catabolic reactions. E) the process stimulates the catabolism of potentially toxic molecules absorbed during digestion.
In most developing countries, ________
A) birth rates equal death rates, so the population is fairly stable B) birth rates are lower than death rates, so the population is declining C) birth rates are lower than death rates, so the population is growing rapidly D) birth rates are much higher than death rates, so the population is growing rapidly
B cells are the main cells of the cell-mediated pathway
a. true b. false