The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed 3-chambered hearts (2 atria, 1 ventricle). Birds and mammals, however, are alike in having 4-chambered hearts (2 atria, 2 ventricles). The 4-chambered hearts of birds and mammals are best described as

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#Question id: 426

#XL - R Botany

Which statement is not true about catabolic pathways?

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#Question id: 6946

#XL - T Zoology

The adult body plan of the fly is based on reiterating structures called segments; segment precursors (parasegments) are first positioned at the cell-by-cell level by which group of genes?

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#Question id: 15174

#XL - S Microbiology

Pyrococcus abyssi and Pyrodictium occultum are hyperthermophiles found in hot areas of the seafloor. They usually do not grow well

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#Question id: 3456

#XL - T Zoology

Which scientist suggested that human social behavior may have a genetic basis?

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#Question id: 3485

#XL - T Zoology

Optimal foraging involves all of the following except

A) maximizing energy gained by the forager.

B) minimizing energy expended by the forager.

C) securing essential nutrients for the forager.

D) minimizing the risk of predation on the forager.

E) maximizing the population size of the forager