Predation of deer by wolves is an example of a
A. death-independent factor.
B. density-dependent limit.
C. density-codependent limit.
D. death-dependent factor.
E. density-independent limit.
B. density-dependent limit.
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Antibodies from the male that coat the sperm may impair fertility by
A) preventing sperm binding to oocytes. B) stretching out the acrosome until the sperm cell bursts. C) causing point mutations in the male genome. D) inducing an autoimmune reaction in the female.
Genetically modified organisms include ________.
A. plants B. bacteria C. nonhuman animals D. viruses E. All of the above have been genetically modified.
An artificial pacemaker supplements the actions of
a. sympathetic neurons. b. the atrioventricular node. c. the medulla oblongata. d. the sinoatrial node. e. the heart muscle itself
What important role do fungi play in many ecosystems?
A) They decompose organic material. B) They pollinate plants. C) They disperse the fruits of angiosperms. D) They perform photosynthesis.