Answer:
Crop rotation is the method of growing a series of different types of crops in the same area across a sequence of growing seasons (China does this). It reduces dependence on just one type of nutrients, it also helps control pests and weeds by the plants developing a resistance all at once.
They use them as food and habitats.
HIV is the only disease listed here to be sexually transmitted.
-Tiara
They help because if you can adapt to things a camouflage evolution will be eaiser.
