Animals can be classified into vertebrates or invertebrates. Animals which are vertebrates are animals which have backbones, while animals which are invertebrates are animals which do not have backbones. Vertebrates are animals with skeleton made of bones in their body. They include fish, birds, mammals, and many more. Their size and mobility often enable them to get used to their environment easily. These are the most advanced organisms on Earth.The way their spinal cords, vertebrae and notochords are structured make them special. Vertebrates are the most advanced organisms on Earth. The traits that differentiate between a vertebrate and an invertebrate is having a spinal cord, vertebrae and notochords. It is all about having a series of nerves along your dorsal side, also known as your back. The notochord is a rod of cartilage helps to give support and protection to our nerves together with our backbone.
For birds, they do not have teeth but they have vestigial tails. They are distinguished from living reptiles by features and the presence of a thin, hollow flight skeleton. Birds have feathers as their outer covering.
For reptiles, the key characteristics of them is that they have an amniotic egg, dry skin and thoracic breathing. For vertebrate amphibians, they include legs, cutaneous respiration, lungs, pulmonary veins, and a partially divided heart. Amphibians are animals whose part of their life are in water while the other part is in land.
There are lesser species of vertebrates than invertebrates, as vertebrates are larger than invertebrates, which also means they need more space. The other reason is that even though they are advanced, there are limitations to the environments that are available to them.
Though there are lesser species of vertebrates, they are indeed smart. In fact, some of them are very smart, which is us. Most vertebrates have advanced nervous systems. While a goldfish could not be compared to a human’s intelligence, when compared to a sea anemone, a goldfish probably be equal to Einstein.