You are walking along the beach and see the remains of an unknown animal washed up on shore. You examine its characteristics and see that it is gelatinous, transparent, bilaterally symmetric, and lacks tentacles. You provisionally identify its phylum according to which choice?
a. Gelatinous body rules out Cnidaria.
b. Lack of tentacles rules out Cnidaria.
c. Bilateral symmetry rules out Platyhelminthes.
d. Transparent body rules out Ctenophora.
B
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The internal body fluids of an osmoconformer can best be described as having:
A. roughly the same total solute concentration as the external environment. B. a higher solute concentration than the external environment. C. a lower solute concentration than the external environment. D. all of the same concentrations of particular ions as the external environment. E. None of the answer options is correct.
Which individual proposed the same idea as
Darwin after studying the wildlife in the Amazon basin?
a. Cuvier b. Lyell c. Lamarck d. Aristotle e. Wallace
Why do the males of many species compete with each other for fertilizing females?
a. Males tend to invest less energy in their offspring than females. b. Males tend to be more aggressive than females. c. Mating as much as possible always maximizes an individual's fitness. d. Female-female competition is absent from species with male-male competi-tion. e. All of the above.
Please select the explanation for why the members of the bacterial family Enterobacteriaceae are commonly pathogenic to humans.
A) This family of bacteria commonly inhabits the human body as normal flora. B) Animals have these bacteria as normal flora, and since humans and animals are in close contact, the bacteria are easily transmitted to humans. C) Humans contact these bacteria easily from soil. D) Humans have no inherited resistance to these bacteria. E) As air contaminants, these bacteria easily are transmitted by respiratory route.