Adult male humans generally have deeper voices than do adult female humans, which is the direct result of higher levels of testosterone causing growth of the larynx
If the fossil records of apes and humans alike show a trend toward decreasing larynx size in adult females and increasing larynx size in adult males, then _____. A) sexual dimorphism was evolving over time in these species
B) intrasexual selection seems to have occurred in both species
C) stabilizing selection was occurring in these species concerning larynx size
D) selection was acting more directly upon genotype than upon phenotype
A
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A) acetylcholine B) epinephrine C) glutamate D) nitric oxide E) gamma-aminobutyric acid (GABA)
Movable DNA sequences are called
A. transposable elements. B. frameshifts. C. transitions. D. centromeres. E. telomeres.
Which of the following is not associated with adhesive junctions?
A) desmosomes B) hemidesmosomes C) plaques D) connexin E) cadherins
The residual volume of the lungs is approximately
a. 1200 milliliters. b. 2000 milliliters. c. 4800 milliliters. d. 3800 milliliters. e. 5200 milliliters.