Fibrin, used in blood clots, is produced by
a. lymphocytes.
b. basophils.
c. erythrocytes.
d. neutrophils.
e. platelets.
E
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Which of the following support(s) the observation that herbivores do not generally eat all of the available plants?
I) top-down control hypothesis II) poor nutrition hypothesis III) plant-defense hypothesis A) only I B) only II C) only III D) only II and III E) I, II, and III
In addition to producing or resisting movement, an important function of muscle is generation of heat.
a. true b. false
Natural selection changes allele frequencies in populations because some __________ survive and reproduce more successfully than others.
A) alleles B) loci C) gene pools D) species E) individuals
Anti-evolutionary thinkers sometimes argue that natural selection could not produce a complex structure like the vertebrate eye. They claim that all of the parts of the eye must have arisen at once, asking why natural selection would favor the
development of part of an eye that is not yet capable of forming a focused image. Which of the statements about the molluscan eye rejects the claim of anti-evolutionary thinkers? A) The anti-evolution argument has a great deal of merit. Only full-blown image-forming eyes are present in modern organisms, including in molluscs. B) There are many intermediate stages of eye complexity, such as those in molluscs, that fulfill different adaptive functions. C) The vertebrate eye is the ancestral form, and other types of organism, such as molluscs, have degenerate eyes that have lost most of their original structure and function. D) The vertebrate eye works in a way that is completely different from the eyes found in molluscs and other invertebrates.