The treeʹs horizontal axis 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. Letʹs 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.

Which of the five common ancestors, labeled V—Z, has given rise to the greatest number of species, both extant and extinct?

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#Question id: 4944

#Section 2: Evolution

What is true of the amino acids that might have been delivered to Earth within carbonaceous chondrites?

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#Question id: 10611

#Section 1: Ecology

If the net reproductive rate (R0) is equal to 0.5, what assumptions can we make about the population?

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#Question id: 12298

#Section 1: Ecology

The number of offspring an individual produces over its lifetime is _______________.

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#Question id: 4698

#Section 2: Evolution

It has been observed that organisms on islands are different from, but closely related to, similar forms found on the nearest continent. This is taken as evidence that

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#Question id: 8850

#Section 2: Evolution

Whatever its ultimate cause(s), the Cambrian explosion is a prime example of