You are interested in studying how organisms react to a gradient of a variety of abiotic conditions and how they coexist in this gradient. The best location in which to conduct such a study is

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#Question id: 12109

#Section 1: Ecology

Niches of two coexisting species of pond snail of the same genus are likely to be similar, but not identical, because of which of the following?

I. Closely related species use similar resources.

II. Competitive interactions exist between these species. 

III.  Unlimited resources are available.

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#Question id: 11262

#Section 1: Ecology

When a social organization consists of cooperative individuals, selection will always favor individuals that increase their personal reproductive success by __________.

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#Question id: 4620

#Section 2: Evolution

The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data?

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#Question id: 10583

#Section 2: Evolution

Suppose you discovered a new species about which youknow only two facts: it is small sized (<10 cm) and short lived (<20 days). Which of the following strategies is most likely to be true for this species?

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#Question id: 10858

#Section 1: Ecology

Which of the following is an example of obligatory symbiotic mutualism?