PLEASE HELP Asap! I’m confused

one type of atom

a pure substance

Explanation: hope this helps :)

A pure substance, and chemically combined elements.

Explanation: It technically is saying select all of the chemical, because element means chemical. Hope this helps, have a wonderful day! Bye.

hey there!

so, when you eat, your teeth chew and grind food into smaller pieces. this is mechanical digestion. then reactions aided by digestive enzymes break down large food molecules into smaller molecules. this is chemical digestion. the two processes change the food into simpler substances that can be used by the body for raw materials and energy.

hope this

tobey