Small, hair-like parts called villi absorb
from the food.
air
nutrients
waste

Ithink its part b hope that

If it's a smaller child or infant, place one on the middle of the chest and on the child's back. (if it is a bigger child with enough room for two, place one on the upper right/your left of the chest, and one on the lower left/your right) the pads should never touch each other. 

The back of the package where the nutrition label is