Adult male humans generally have deeper voices than do adult female humans, which is the direct result of higher levels of testosterone causing growth of the larynx. If the fossil records ofapes and humans alike show a trend toward decreasing larynx size in adult females and increasing larynx size in adult males, then

#Question id: 4637

#Section 2: Evolution

A biologist studied a population of squirrels for 15 years. During that time, the population was never fewer than 30 squirrels and never more than 45. Her data showed that over half of the squirrels born did not survive to reproduce, because of competition for food and predation. In a single generation, 90% of the squirrels that were born lived to reproduce, and the population increased to 80. Which inference(s) about this population might be true?

A) The amount of available food may have increased.

B) The number of predators may have decreased.

C) The squirrels of subsequent generations should show greater levels of genetic variation than previous generations, because squirrels that would not have survived in the past will now survive.

Choose correct combination,

#Question id: 10673

#Section 2: Evolution

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

#Question id: 10856

#Section 1: Ecology

By inhibiting sexual reproduction by their hosts, what advantage is gained by parasites such as endophytic fungi?

#Question id: 11175

#Section 1: Ecology

Leks

#Question id: 10677

#Section 1: Ecology

What interactions occur in epiphyte plants that grow on other plants?