Exposure to which of the following chemicals is correlated with low birth weight and premature birth?
A) the plasticizer di(2-ethylhexyl)phthalate (DEHP)
B) bisphenol A (BPA)
C) the synthetic estrogen diethylstilbestrol (DES)
D) polychlorinated biphenols (PCBs)
D
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The long snout of the giant anteater, Myrmecophaga tridactyla, of South America, and the echidna, Tachyglossus aculeatus, of Australia, are animals of different evolutionary lineages that are both adapted to eating ants. This is an example of
A. selective breeding. B. anatomical homology. C. analogous traits. D. artificial selection. E. Both analogous traits and artificial selection are correct.
Painful spasms of the throat triggered by swallowing or the sight of water is called
A. hydrophobia. B. hydrophagia. C. tetany. D. paralysis.
Side A is __________ to side B
a. hypertonic b. hypotonic c. isotonic d. either isotonic or hypertonic e. either isotonic or hypotonic
The difference between the two atoms in Figure 2-1 is:
a. pH.
b. the number of electrons.
c. the number of protons.
d. the number of neutrons.
e. electrical charge.