Students who major in zoology spend a lot of time outdoors studying animals and their habitats. They also study the effects of humans on animals' environment and how to lessen these effects. Some jobs in zoology require an associate or a bachelor's degree, while others demand a degree that takes longer to obtain.
Every living organism needs a home, shelter or environment that provides the safety, ideal emperature and basic things it needs to survive. more science lessons: Asexual Reproduction
So: living things need DNA (or something with an equivalent function) to transmit information from generation to generation; information necessary for the creation, development, and survival of every individual of every species. Changes to the sequence of the DNA over time allow evolution into new species to occur.