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: 353

#XL - Q Biochemistry

Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake?

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#Question id: 12902

#XL - S Microbiology

An extension of microarray technology may also be used to analyze tissue sections,this process is known as_____

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#Question id: 19512

#XL - P Chemistry

In a group of the periodic table the Ionization enthalpies of the elements decreases from top to bottom because of ———-

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#Question id: 10171

#XL - R Botany

Quantum flux, or photon flux density (PFD), is the number of incident quanta (singular quantum) striking the leaf, expressed in

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#Question id: 19620

#XL - P Chemistry

Only a simple homogeneous reaction requires which of the following methods?