What is the muscular tube that connects the pharnx to the stomach?

The tube that connects to mouth to the stomach is the esophagus.

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 answer would be d. most contraceptives are effective when used properly