The rules of biology and physics that can be used to prevent injury to your body joints are called

biomechanical principles

Explanation:

The lower the center of mass, the larger the base of support, the closer the center of mass to the base of support, and the greater the mass, the more stability increases

put her wishes into writing and have them notarized.   hand them out to her loved ones.

explanation:

it's a nutrition food for pregnant mothers so they unborn child can get its nutrition that it needs to grow in to a healthy baby.

explanation:

and the mother is getting all of her nutrition and her calcium and vitamins .