The density and spacing of individuals within suitable habitat and the proportions of individuals in each age class comprise a population's __________. 

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#Question id: 12363

#Section 1: Ecology

Relative to populations with long prereproductive periods, populations with short prereproductive periods tend to

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#Question id: 9216

#Section 2: Evolution

Which of the following criteria have to be met for a species to qualify as invasive?

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#Question id: 12145

#Section 2: Evolution

If population size is exactly half of carrying capacity: 

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#Question id: 12412

#Section 1: Ecology

In most mammalian populations the sex ratio

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#Question id: 11058

#Section 1: Ecology

The pufferfish, a common marine fish, has extensive spines that extend outward when it swallows water, becoming several times its normal size. This is an example of what kind of defense against predation?