Riparian zones are valuable habitats because they
a. are a line of defense against flood damage.
b. conserve water during droughts.
c. provide food, shelter, and shade to wildlife.
d. are home to more than 65 percent of the endemic
species of the western United States.
e. provide all of these.
Answer: e
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Which of the following would occur from a mutation in the gene's promoter region?
A. The sequence of the mature mRNA would change. B. The ability of pre-mRNA to be properly spliced would change. C. The ability of mRNA to be translationally regulated would change. D. The amino acid sequence of the translated protein would be altered. E. The rate of transcription may increase or decrease.
. When allopatric populations reestablish contact upon elimination of a geographical barrier, ____ has occurred
a. species clustering b. secondary contact c. parapatric speciation d. sympatric speciation e. evolutionary convergence
Which vertebrate body system is most closely associated functionally with respiration?
a. urinary b. digestive c. endocrine d. circulatory e. integumentary
Neurofibrillary tangles occur:a
in the neuron cytoplasm of patients with Alzheimer's disease. b. in the axon of patients with multiple sclerosis. c. in the glial cells of patients with myasthenia gravis. d. in the dendrites of patients with peripheral neuropathy. e. in the cell bodies of patients with depression.