Answer:
“Non-self” materials have proteins and other substances on their surfaces that the body doesn't recognize, called antigens.
Explanation:
Answer:
Amino acids are made from natural materials.
Explanation:
The answer is B. It is the only one where each element has the same number of molecules on each side.
It is muscle and nerve tissue
Our bodies produce an enzyme called lactase. This enzyme helps our bodies digest lactose (a sugar found in milk). As we age, the amount of lactase our bodies produce decreases. Some people don’t produce as much as others. If you are lactose intolerant, it means your body doesn’t produce a lot of lactase. One option is to drink milk with lactase added to it.
Example: Lactaid
