"Zoology is a branch of biology that studies the members of the animal kingdom and animal life in general. It includes both the inquiry into individual animals and their constituent parts, even to the molecular level, and the inquiry into animal populations, entire faunas, and the relationships of animals to each other, to plants, and to the nonliving environment."
Source: Hanson, Earl Dorchester. "Zoology." Encyclopedia Britannica, Encyclopedia Britannica, ic., 25 Jan. 2017, www.britannica.com/science/zoology.
