Which is characteristic of all vertebrates?

Question

Quizplus · Accepted Answer

The presence of a skull and a backbone consisting of vertebrae is a defining characteristic of all vertebrates, which includes fish, amphibians, reptiles, birds, and mammals. This distinguishes them from invertebrates, which lack a backbone. Therefore, choice A is the correct answer. Choice B is incorrect as not all vertebrates have four legs. Choice C is incorrect as not all vertebrates have a hinged jaw. Choice D is also incorrect since some early vertebrates, such as jawless fish, relied on gills for respiration.

Which Is Characteristic of All Vertebrates