Predation is an interaction between individuals of 2 species in which one is harmed (the prey), and the other is helped (the predator). Predation can occur among plants and animals as well as between plants and animals. Some biologists contend that herbivores, or plant eaters, are predators. Table 1 indicates some characteristics and examples of certain predators. According to information in the passage, the number of prey consumed in an ecosystem is dependent on:

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the number of predators present and the number of prey present.. The best answer is D. The passage states that "the number of prey consumed depends on the number of prey present as well as the number of predators present." The other answer choices are not supported by the passage.

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the natural balance of the ecosystem.

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the total number of predators that die because of predation.

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the type of parasites available in the ecosystem.

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