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
Organisms need to take food so that they can get raw material for growth and repair and can get energy for carrying out various activities. A parasite lives on or inside the body of another organism; to get shelter and food.