Which of the following is a characteristic of biodiversity hotspots?
a. high percentage of degraded habitat
b. small number of endemic species
c. encroachment of human habitats
d. widespread poaching problems
a. high percentage of degraded habitat
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The reason Darwin sailed aboard the H.M.S. Beagle was because he ____
a. wanted to develop his theory of evolution b. was invited to be the ship's naturalist c. was invited to be the ship's geologist d. was invited to be the captain's dining companion e. was invited to be the captain's personal physician
A gene on the X chromosome is said to be
a. heterozygous. b. sex limited. c. x-linked. d. bipolar. e. a mutation.
Which of the following is NOT involved in altering the resistance of the airway to air movement?
A) secretion of mucus into the airway B) transpulmonary pressure C) contractile activity of bronchiolar smooth muscle cells D) tractive forces exerted on the airway by surrounding tissue E) pulmonary surfactant concentration
Gram-negative nitrogen-fixing bacteria found in association with plant roots are
A) alphaproteobacteria. B) betaproteobacteria. C) cyanobacteria. D) gammaproteobacteria. E) deeply branching bacteria.