Modern behavioral concepts relate the cost of a behavior to its benefit. Under which relationship might a behavior be performed?

A) cost is greater than the benefit

B) cost is less than the benefit

C) cost is equal to the benefit

#Question id: 10612

#Section 1: Ecology

dN/dt = rN (K-N/K )

The logistic equation above is used to describe therate of change of a population, N, with time, t, Where r is the intrinsic rate of increase and K is the carrying capacity. Which of the following value of N showing maximum growth rate?

  ( K= 420, r =.05)

#Question id: 10642

#Section 1: Ecology

Which curve best describes survivorship in a songbirds and marine crustacean that molts respectively?

#Question id: 4645

#Section 2: Evolution

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?

#Question id: 9203

#Section 2: Evolution

The human impact that scientists determined has caused the most extinctions on record is ________, and beyond further losses from this impact, the other impact with the largest potential to cause future extinctions is ________.

#Question id: 12456

#Section 1: Ecology