The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed three-chambered hearts (two atria, one ventricle). Birds and mammals, however, are alike in having four-chambered hearts (two atria, two ventricles). The fourchambered hearts of birds and mammals are best described as ________.

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#Question id: 12115

#Section 4: Behavioural Ecology

Although many  chimpanzee populations  live  in  environments containing oil  palm  nuts,  members of  only  a  few populations use stones to crack open the nuts. The most likely explanation for this behavioural difference between populations is that

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#Question id: 3387

#Section 2: Evolution

Observe the following hypothetical populations Which of these populations, if any, is in Hardy-Weinberg equilibrium

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#Question id: 10649

#Section 2: Evolution

According to the logistic growth equation

A) the number of individuals added per unit time is greatest when N is one fourth of K

B) the per capita growth rate (r) increases as N approaches K

C) population growth is zero when N equals K

D) the population grows exponentially when N approaches K

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#Question id: 12264

#Section 1: Ecology

You discover several species of unpalatable insects that closely resemble each other. You propose that this is an example of __________ mimicry. 

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#Question id: 3353

#Section 2: Evolution