Closely related organisms often share similar structures in their bodies, despite their different lifestyles. The simplest explanation for such similarities is that both species descended from a common ancestor with simi... More »

Echinoderms and chordates are related in the sense that they both belong to the deuterostome superphylum, exhibiting somewhat similar patterns of early development during the embryonic stage. The differences between the ... More »

Vestigial structures support the theory of evolution by adding observable evidence to the model of common ancestry. Vestigial structures are not necessarily without function. In fact, according to Austin Cline at About.c... More »

The theory of evolution is supported by biochemical evidence; many of the same molecules and biochemical processes occur within all living organisms, from single-cell bacteria to humans. Originally, scientists couldn't u... More »

Analogous structures are similar features of different animals that have evolved due to convergent evolution. When two different species live in similar environments, they often evolve in a similar way. This causes the b... More »

Biological evolution is defined as organisms reproducing but experiencing changes with each generation. Evolution can happen in a small and large context. There are small genetic changes between generations, as well as l... More »

Divergent evolution is the mechanism that causes different species to arise from common ancestors, the evolution toward greater difference in related organisms. In the classification system it is a part of, it is one of ... More » Science Biology