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.

According to this tree, what percent of the species seem to be extant (i.e., not extinct)?

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#Question id: 11512

#Section 2: Evolution

The mortality rate of organisms following a type iii survivorship curve is

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#Question id: 12110

#Section 4: Behavioural Ecology

Which of the following has the smallest biomass?

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#Question id: 10818

#Section 1: Ecology

Which of these relationships is generally not considered one that underlies community structure?

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#Question id: 11510

#Section 1: Ecology

Life history trait varies environmental condition, both survivorship and fecundity is habitat dependent in practice but intrinsic rate of increase can change as environmental change. Following life history trait is characteristic of r-selected species?

A) Later age at first reproduction                    B) Long generation time

C) Multiple broods per life spans                    D) Large number of offspring per brood

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#Question id: 10673

#Section 2: Evolution

Which of following attributes of parasite agent acts as a biological control is not necessary?