Which evolutionary trend is common to reptiles, birds, and mammals?
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Correct answer: Development of amniotic egg
Reptiles, birds, and mammals are all amniotes — their embryos develop within a fluid-filled amniotic sac. This membrane, along with the chorion and allantois, protects the embryo and enables reproduction completely independent of free water.
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More Reptilia, Aves and Mammalia questions
- Which fossil form is considered a connecting link between reptiles and birds?
- Which feature distinguishes birds from reptiles?
- Which metabolic condition is shared by birds and mammals?
- Which reptilian adaptation is considered a precursor to mammalian skin?
- The evolutionary success of mammals is mainly attributed to:
- Which feature is characteristic of reptiles that enabled their complete adaptation to terrestrial life?