Evidence of Evolution
There are four main pieces of evidence that support Darwin's theory:
The fossil record shows how old the earth really to be. The fossils showed a gradual change over
time. They showed that some organisms had lived for awhile and died out, too. It also proved what else he believed true that
by looking at fossils you can see a change over time in that organism.
- Geographic Distribution of Living Species-
Darwin's natural selection and descent with modification supported this. That through natural
selection some organisms were "selected" over others because it could survive and flourish there. Descent with modification
is also shown because organisms might have had different ancestors. But, they since some organisms live under the same environment
"pressures" they have similar features.
- Homologous Body Structure-
In a homologous body structure is when organisms have different ways of using certain mature
structures but they are basically the same structure. An example of this is bones. Fish, mammals, and birds all have different
mature forms. (Fish has fins; mammals have hoof, paw, or hand; and birds have wings.) But they still all have the
"same" 5 groups of bones. This is probably one of the strongest evidence it suggests we (above animals) have
all came from common ancestors.
- Similarities in Early Development-
Like the above homologous this shows again that almost all animals have a similar ancestor. Organisms'
embryos look very much alike and seem not to differ even if one is a bird, mammal, or reptile.