Which of the following is most likely a density-dependent growth regulator of animal populations?

What absolutely essential resource is likely to limit the carrying capacity of Earth for humans?

An ecologist would suspect a population to be growing rapidly if it __________.

If you wanted to determine what percentage of the population of Thailand is less than 10 years old, you could look at __________.

The cyclic growth exhibited by populations of snowshoe hares in the North American taiga most likely results from __________.

A particular environmental change causes the deaths of 25 individuals in a herd of 100 wild horses, and it kills 50 individuals in a herd of 200 horses. In this case, the growth of a wild horse population is most likely limited by __________. (Assume that the two herds are found in territories of equal size.)

A certain species of seal breeds and rears its young on rocky beaches. Competition for breeding sites is fierce, and males that do not secure a site will not reproduce. This behavior is an example of which mechanism of density-dependent population regulation?

Which of the following would most likely be an example of a density-independent factor limiting population growth?

Although there are organisms whose life histories fall somewhere between iteroparity and semelparity, life history always represents a trade-off. Why is this?