We recognize three levels of biodiversity: genetic
diversity, species diversity, and
__________diversity. Fill in the blank(s) with the appropriate word(s).
Answer: ecosystem
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Air rushes into the lungs of humans during inhalation because
A. the volume of the thoracic cavity increases. B. pressure in the alveoli increases. C. the diaphragm contracts and pushes upward on the chest cavity. D. smooth muscle lining the trachea, bronchi and bronchioles contracts and causes their volume to increase. E. pulmonary muscles contract and pull on the outer surface of the lungs.
bio refers to a gene that governs a cell's ability to synthesize biotin from inorganic precursors. The
designation bio+ indicates:
a. that the allele is normal. b. that the allele is the mutant allele. c. that the bacterium is biologically active. d. that the bacterium is biologically inactive. e. that the bacterium cannot make its own biotin.
Which environment is most likely to produce trees without annual rings?
A. Tropical rain forest B. Northern evergreen forest C. Areas with alternating wet and dry seasons D. Temperate-deciduous forests E. None of these, because annual rings are characteristic of all trees
A "stitch" in the side experience during vigorous exercise is due to the contraction of the liver as it releases additional blood into the bloodstream.
Indicate whether the statement is true or false.