Question

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

Answer 1

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

What about homoplasies?

• It is more frequently a modified version of an inherited characteristic.
• For instance, the scales that were already present in its reptilian parent led to the evolution of feathers in birds.
• Similar to reptiles, mammals developed fur from their predecessors' scales.
• The same set of data can typically yield more than one potential cladogram.
• Different species of legged lizards developed into snakes and lizards with limbless bodies.
• Natural selection does not affect a sizable number of mutations.
• They came to the conclusion that reptiles, birds, and mammals all descended from the same ancient reptilian progenitor.

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