How Many Vertebrates Are
Evidence of true vertebrates began appearing 525 million years in the past and ever since then, vertebrates have branched off into a long lineage that includes armoured fish and large sauropods to woolly mammoths and fashionable man. One of the ways life is assessed is thru the presence or absence of the vertebrate. Vertebrates and invertebrates developed from a common ancestor that was speculated to have lived round 600 million years in the past. Invertebrates are animals with no backbone, meaning they don’t have any vertebrae. This type of animal might sound fancy, however more than likely you have already seen tons of in your lifetime.
In vertebrates, the anterior end of the nerve tube expands and differentiates into three brain vesicles. In this post, we’ll lay out what makes an animal an invertebrate, how they differ from vertebrates and how they ensure the survival of … Read MoreRead More »