For several years, scientists have warned doctors of the danger of overprescribing antibiotics, such as penicillin. Scientists are concerned because __________.
a. humans will become tolerant to the effects of drugs
b. the organisms that produce many of the antibiotics are overexploited and could become extinct
c. natural selection can lead to strains of microorganisms resistant to these drugs
d. the drugs will be metabolized more quickly by our bodies, decreasing their effectiveness
e. None of the listed responses are correct.
Answer: c. natural selection can lead to strains of microorganisms resistant to these drugs
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The letter "C" in the accompanying figure represents the ____ plane
a. transverse b. radial c. tangential d. elliptical e. obtuse
Henrietta knows her arm's position as she lifts it away from her body in a completely darkened room because her brain is getting information from these general sense receptors
A) Merkel discs B) thermoreceptors C) hair cells D) Golgi tendon organs
The insects in the diagram above represent all of the following except
A. herbivores.
B. the second trophic level.
C. primary consumers.
D. producers.
Which observation is inconsistent with Haeckel's idea that "ontogeny recapitulates phylogeny"?
A. The pharyngeal clefts and branchial arches of embryonic mammals and reptiles never acquire the form seen in adult fish. B. All tetrapod embryos display pharyngeal clefts, a notochord, segmentation, and paddlelike limb buds. C. Snakes and legless lizards develop "leg buds" as embryos, only to have them reabsorbed prior to hatching. D. In reptile embryos, two bones develop into the articular bones of the hinge of the jaw, while these same bones become the hammer and anvil of the inner ear in marsupials. E. The backbone