List as many examples of types of proteins, and give a brief definition of each

1. Structural proteins, maintain cell shape, akin to a skeleton, and compose structural parts of the body, like cartilage and bone in vertebrates.

2. Storage proteins house critical elements that your body needs.

3. Hormonal proteins basically act as your body's chemical "messengers."

4. Enzymes, which are biological catalysts needed for chemical reactions.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".