Answer:
How many of you remember the Brady Bunch episode in which Peter was studying for a biology test? He asked Marcia for help, and she taught him the mnemonic: “A vertebrate has a back that’s straight.” Well, not all vertebrates have straight backs, but all have backbones, or vertebral columns, that help support their bodies.
Although the vertebral column is perhaps the most obvious feature in vertebrates, it was not present in the first ones, which probably had only a notochord (flexible rodlike structure which plays a role in the development of the nervous system). The vertebrate has a distinct head, with a differentiated brain and three pairs of sense organs (nasal, optic, and otic [hearing]). The body is divided into trunk and tail regions.
Several groups of vertebrates inhabit planet Earth. Let’s take a tour of the five main vertebrate groups alive today: the fishes, amphibians, reptiles, birds, and mammals.
Explanation:
crown please
