The answer to 20. is A.
B wouldn't affect the plates,
C would push the plates downwards,
and D.... I don't even know what that is.
It protects us from ever present bacterial infections.
Hyperthyroidism (over producing thyroid gland) and hypothyroidism (under producing thyroid gland).
<span>Enzymes are biological catalysts (they are proteins). Enzymes regulate metabolic pathways in the body.
e.g. Digestive enzymes in your stomach speed up the hydrolysis and breakdown of carbohydrates, proteins and fats in the food you consume.</span>
C. is essential in the synthesis of dna and in the development of red blood cells.