Involuntary muscles are not as willing as voluntary ones. Methane, a greenhouse gas, comes from the burning of trees and cows. The spinal column is a long bunch of bones. The head sits on the top and you sit on the bottom. Water is melted steam.
Mushrooms always grow in damp places and so they look like umbrellas.
A monkey has a reprehensible tail. Some people say we condescended from the apes. The leopard has black spots which look like round soars on its body. Those who catch soars get leprosy. A cuckoo does not lay its own eggs.