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: 35518

#XL - R Botany

Which of the following genes encode MADS-box transcription factors involved in the ABC model?

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#Question id: 35519

#XL - R Botany

Which of the following statements are true regarding photoperiodism in plants?

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#Question id: 35520

#XL - R Botany

Which of the following are true about vernalization in flowering plants?

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#Question id: 35521

#XL - R Botany

Which of the following are correctly matched with their roles in flowering?

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#Question id: 35522

#XL - R Botany

Which of the following characteristics are true for florigen?

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#Question id: 35523

#XL - R Botany

Which of the following statements correctly describe how plants respond to environmental cues to initiate flowering?