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

TLS Online TPP Program

#Question id: 12452

#Section 1: Ecology

Butterflies are used as an example of a species with

TLS Online TPP Program

#Question id: 10647

#Section 2: Evolution

Use the graph to answer the following question

In the figure, which of the following survivorship curves implies that an animal may lay many eggs, of which a regular number die each year on a logarithmic scale?

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#Question id: 10875

#Section 1: Ecology

When the population density of species P , then

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#Question id: 10833

#Section 1: Ecology

All the organisms that occur in the redwood community

TLS Online TPP Program

#Question id: 10833

#Section 2: Evolution

All the organisms that occur in the redwood community