Anatomy is the branch of science the studies the structures of living things, like their skeletons, organs and muscles. When scientists compare the anatomy of living things to each other we call that, comparative anatomy. It can help us understand how living things are related.
To better understand comparative anatomy…
LET’S BREAK IT DOWN!
Human anatomy, especially the skeletal system, has many similarities to other organisms. This is evidence for evolution because organisms that share similar structures have common ancestors. The more structures that are similar, the more closely related organisms are in their evolutionary past. For example, a human, a dog, a fruit bat, and a dolphin all have the same pattern of bone structure in the upper extremity—one bone connected to two bones, connected to many bones, connected to finger-like bones.
Development of Embryos
All organisms start from a single cell. Then as those cells divide, a mass of cells form a familiar shape known as an embryo. Embryos are unborn or unhatched babies. Humans develop from embryos like other organisms, and those embryos look similar early in development. In fact, human embryos grow a temporary tail that later disappears. Embryos have similar structures that grow and develop into other structures later in life. For example, pharyngeal slits are present in both fish and human embryos, but they become the gills of fish and the throat and jaw region of a human. Organisms showing similarities in embryonic development are evidence of evolution because the more similar organisms are, the more closely related they are in the past