Question

define what is meant by a notochord.

Answer 1

A flexible rod like structure that forms the main support of the body in the lowest chordates; a primitive spine

Answer 2

notochord is a primitive beginning to the backbone. It appears in embryos as a small flexible rod made from cells from themesoderm, which is one of the three layers of cells of embryos. Notochords are only found in the phylum chordata, a group of animals that includes humans. In fact, it is the defining feature of that particular phylum. Notochords, and furthermore backbones, are what separate us from the more primitive living creatures that we encounter.