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The Sub phylum veterabata includes all animals with a backbone gills and a central nervous system.
The class agnatha have no fins, no scales, and no jaw. Skeleton of cartilage,They are not true vertebrae they are supported by a notochord
Lamprey
Giraffe
The classes chrondricthyes and ostheichthyes are both jawed vetebrates unlike class agnatha which are jawless example of class chrondricthyes are sharks and an example of classs osteichthyes is tuna
Sarcopterygii had weight bearing limbs which evolved into fully jointed limbs as we can see in humans they also had lungs to help the transition from water to land.
The tiktaalik was a fish that marked the transition between sea creatures and amphibians. has traits common to the first four-footed animals.Amphbians have the following :Endoskeleton made mostly of bone,skin is smooth with many capillaries and pigments, no scales.
usually two pairs of limbs with webbed feet.
As many as four organs of respiration.
a three chambered heart and they are Oviparious with external fertilization.
Reptile eggs became amniotic, so they can be laid on land instead of in water. This allowed them to move around more.
During the Mesozoic Era, life diversified rapidly and giant reptiles, dinosaurs and other enormous beasts roamed the Earth.
The two main characteristics of hominids are bipedalism and big brains.
Australopithecus is a genus of hominins that existed in Africa from around 4.2 to 1.9 million years ago
Homo habilis is an archaic species of Stone Age human which lived between roughly 2.3 and 1.5 million years ago
The oldest known early humans to have possessed modern human-like body Their first apperances were from about 1.9mya
Neanderthals are an extinct species or subspecies of archaic humans who lived in Eurasia until about 40,000 years ago.
Homo sapiens is the only extant human species. The name is Latin for wise man