The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data?

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#Question id: 12109

#Section 1: Ecology

Niches of two coexisting species of pond snail of the same genus are likely to be similar, but not identical, because of which of the following?

I. Closely related species use similar resources.

II. Competitive interactions exist between these species. 

III.  Unlimited resources are available.

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#Question id: 8294

#Section 2: Evolution

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: 3329

#Section 2: Evolution

The following genotypes of one locus in population are given  - Genotype ( Number)

AA (120)  AB ( 30)  BB  (50) CC  (300)

AC  (400)  BC (100)

Which of the following is the correct frequency of C allele and A allele respectively?

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#Question id: 3429

#Section 2: Evolution

Which of the following is a behavioral pattern that results from a proximate cause?

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#Question id: 11245

#Section 1: Ecology

Monogamy is most prevalent among ______ and is rare among ________.