A
crop is any
cultivated plant,
fungus, or
alga that is
harvested for
food,
clothing,
livestock fodder,
biofuel,
medicine, or other uses. In contrast,
animals that are raised by
humans are called livestock, except those that are kept as
pets.
Microbes, such as
bacteria or
viruses, are referred to as
cultures. Microbes are not typically grown for food, but are rather used to alter food. For example, bacteria are used to
ferment milk to produce
yogurt.