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 been most successful in terms of the percent of its derived species that are extant?

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#Question id: 11349

#Section 1: Ecology

Prey exposed to a predator may __________.

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#Question id: 12443

#Section 1: Ecology

r-strategists typically

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#Question id: 12150

#Section 1: Ecology

You are studying population dynamics in three species of small aquatic invertebrates called water fleas. Among these species, which is most likely to exhibit regular population cycles? 

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#Question id: 10634

#Section 2: Evolution

Consider a population which is changing from one generation to the next as per the equation N(t) = R*N(t-1), where N(t) represents the size of the population at time t and R is a constant growth parameter. Under what condition is the population likely to go extinct?

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#Question id: 12446

#Section 1: Ecology

Which of the following factors will affect population growth rates?