The horizontal axis of the cladogram depicted below is a timeline that extends from 100,000 years ago to the present; the vertical axis represents nothing in particular. The labeled branch points on the tree (V-Z) represent various common ancestors. Let's say that only since 50,000 years ago has there been enough variation between the lineages depicted here to separate them into distinct species, and only the tips of the lineages on this tree represent distinct species.

 In Darwin's tree of life, each fork in the tree represents ________.

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#Question id: 10844

#Section 1: Ecology

In the formula for biotic potential (dN/dt = rIN), what does n stand for?

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#Question id: 8691

#Section 2: Evolution

Use the following information to answer the question.

Applying the principle of parsimony to the trait "ability to fly," which of the two phylogenetic trees is better?

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#Question id: 10817

#Section 1: Ecology

Removal of a __________________ from a community affects community structure significantly.

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#Question id: 10744

#Section 1: Ecology

Something that triggers a fixed action potential (FAP) is considered to be a(n) _____________.

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#Question id: 16752

#Section 5: Applied Ecology & Evolution

The property of a test to identify the proportion of truly ill persons in a population who are identified as ill by a screening test