HIV is an equal opportunity virus. The CDC states the largest obstacle in combating the war on AIDS is "combating complacency." This complacency is often displayed in the thought that "it won't happen to me."
a. true
b. false
Answer: a. true
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At the bottom of an energy pyramid are the ____
a. primary producers b. secondary producers c. primary consumers d. secondary consumers e. tertiary consumers
Which of the stages or structures in Figure 51-1 was formed by the process of gastrulation?
a. 1 b. f c. g d. 3 e. 5
You arrive back in the United States after having visited a foreign country located on another continent. The customs agent stops the person in front of you and confiscates the fruit basket this person is bringing home
Being the knowledgeable person you are, you calmly explain to your enraged fellow traveler that the reason for the detainment is that the fruit basket may be ________. A) carrying endangered fruit B) carrying a non-native species that could damage North American ecosystems C) contaminated with CFCs that will damage the ozone layer above North America D) contaminated with sufficient DDT to cause serious harm to anyone who eats the fruit
You have been assigned to address a problem of overpopulation of species X in a nearby county. One of the members of your team suggests introducing species Y, which is a natural predator of species X, but not normally found in the area. After some discussion, you go ahead and introduce species Y. What aspects of the hierarchical organization may be affected within a period of a several years?
A. organism, population, species B. population, species, community, biosphere C. population, species, community D. population, community