In a municipal wastewater treatment plant, the primary treatment step includes ________.

In a typical stream, where the gradient is steep, the discharge is _____.

Lack of body fluids is to thirst as ________ is to ________.

Long before humans invented it to power aircraft, jet propulsion evolved in _____.

Most _______ are secreted into the extracellular fluid from endocrine glands or tissues.

Most mutagens are carcinogens. this is because __________.

The sleep?wake cycle typically follows a 24-hour cycle and is regulated by the __________.

When an ectopic pacemaker leads to an extrasystole, the ______.

The capillaries that nourish the epithelium and absorb digested nutrients lie in the ________.

The pelvic girdle does not include the ________.

The layer of the heart wall that receives the stimulus from letter e is called the ________.