Humans are members of the kingdom Animalia, the phylum Chordata, the class Mammalia, the order Primates, the family Hominidae, the genus Homo, and the species sapiens.
Constructing phylogenies by comparing morphology and molecular data helps us understand the evolutionary relationships among organisms.
As living organisms, humans are made up of cells and tissues. Epithelial tissue covers the surface of the body, and connective tissue creates internal cohesion.
The skeleton is the basic support structure for the body and acts as the anchor for the muscles and other organs.
The circulatory and respiratory systems ensure that oxygen, nutrients, and immune system agents are able to move around the body and function effectively.
The nervous system and the brain are composed of neurons and neuroglia that act to gather information and coordinate and regulate the actions and patterns of the body.
