The skeletal system supports and protects the body and the muscular system is for movement.
I think this is ether b. Trait or C. Allele, pretty sure it’s allele though. Good luck!
The answer is Insulin.
Insulin allows cells in the muscles, liver and fat (adipose tissue) to take up this glucose and use it as a source of energy so they can function properly. Without insulin, cells are unable to use glucose as fuel and they will start malfunctioning.