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: 35622

#XL - R Botany

Which of the following molecular interactions are involved in auxin-regulated development of meristems?

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#Question id: 35623

#XL - R Botany

Which processes are influenced by auxin concentration peaks in apical meristems?

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#Question id: 35741

#XL - S Microbiology

Which of the following statements regarding Bacterial Origin is/are Correct ? 

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#Question id: 35741

#XL - Q Biochemistry

Which of the following statements regarding Bacterial Origin is/are Correct ? 

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#Question id: 35741

#XL - R Botany

Which of the following statements regarding Bacterial Origin is/are Correct ? 

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#Question id: 35741

#XL - T Zoology

Which of the following statements regarding Bacterial Origin is/are Correct ?