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Sidana
1 month ago
9

The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed three- chambered hea

rts (two atria, one ventricle). Birds and mammals, however, are alike in having four- chambered hearts (two atria, two ventricles). The four- chambered hearts of birds and mammals are best described as _____.
Biology
2 answers:
garik1379 [2K]1 month ago
5 0
The hearts of birds and mammals, which have four chambers, are accurately classified as homoplasies. In evolutionary terms, homoplasies refer to traits that are shared across different species, even though their common ancestors lacked these traits entirely. To illustrate, both bird and bat wings perform a similar function of enabling flight, yet these structures evolved separately without being present in their ancestors. Consequently, while birds and mammals each have a four-chambered heart, their predecessors only possessed three chambers. This independent evolution exemplifies homoplasy.
s2008m [2.3K]1 month ago
4 0
Birds and mammals have independently developed four-chambered hearts.
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