Reptiles and all later vertebrates share what feature?

Question

BlackTom AI · Accepted Answer

The question asks which feature is shared by reptiles and all later vertebrates.
Option a: 'a. Reproduction via the amniotic egg' is correct because the amniotic egg is a key evolutionary adaptation that characterizes amniotes, including reptiles, birds, and mammals, allowing embryos to develop in a protected internal membrane and not require aquatic environments.
Option b: 'the ability to stand on two legs' is not a universal trait among reptiles or later vertebrates; many reptiles (like lizards and snakes) do not stand upright on two legs, and stance varies widely across lineages.
Option c: 'the ability to fly' is not shared by reptiles broadly; only a subset of reptiles (ancillary to birds) air-adapted animals exist, and most reptiles cannot fly, so this is not a universal shared feature.
Option d: 'Warm bloodedness' is incorrect because reptiles are generally ectothermic (cold-blooded), and warm-bloodedness is characteristic of birds and mammals, not reptiles as a group.
Therefore, the only feature that unites reptiles with all later vertebrates is reproduction via the amniotic egg.

Reptiles and all later vertebrates share what feature?单项选择题

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Reptiles and all later vertebrates share what feature?

Reptiles and all later vertebrates share what feature?

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