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.

How many separate species, both extant and extinct, are depicted in this tree?

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#Question id: 11765

#Section 2: Evolution

The population density of a particular insect species was determined to be 15,000 adults per hectare in the summer of 1996, 21,000 adults per hectare in the summer of 1997, and 29,400 adults per hectare in the summer of 1998. Based on these population estimates, what is your estimate of λ, the annual rate of geometric growth?

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#Question id: 10830

#Section 2: Evolution

Which of the following helps a prey species avoid being detected by a predator?

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#Question id: 16769

#Section 5: Applied Ecology & Evolution

All of the following are potential benefits of a randomized clinical trial, except

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#Question id: 4586

#Section 2: Evolution

 What are adaptations?

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#Question id: 11501

#Section 2: Evolution

According to the endosymbiotic theory of the origin of eukaryotic cells, how did mitochondria originate?