Which types of effects are typically associated with a mother's use of drugs during the early weeks of her pregnancy?

Astructural difference between the trachea and esophagus that prevents the trachea from collapsing is the presence of: a) smooth muscle b) skeletal muscle c) respiratory cilia d) rings of cartilage

True or false. mucous membranes secrete mucus that traps pathogens.

What is the only part of your body called that should touch the ball when setting in volleyball?