It consists of skin, hair, nails, and glands. The skin protects the body from the environment on the outside. It also functions to retain body fluids, protect against disease, eliminate waste products, and regulate body temperature. It also helps store fat and water.
Hope This Helps!
Example of multi cropping is tomatoes+onions+marigold
I believe it’s a or c. and those links are so annoying i had to start a new account