The breaking down of food in the alimentary canal is called?

Digestion! It is a group of organs in the body which work together to digest food. Digestion is the process by which our body breaks down food into substances we can take in (absorb) and use. Food travels through the alimentary canal which starts at mouth and ends at the anus.

They might be white heads, basically pimples but you should ask your parents to check them out before it’s something bad.