1. In the human body, the _______ is a muscular membrane
that separates the thoracic cavity from the abdominal cavity.
A. epiglottis
B. esophagus
C. diaphragm
D. bolus

2. In kidneys, the tiny tubules that produce urine are called
A. nephrons.
B. the ureters.
C. the renal cortex.
D. the renal medulla.

3. Which of these plant hormones hastens the ripening of fruit
and helps to cause the fall of leaves, flowers, and fruit?
A. Cytokinins
B. Auxins
C. Ethylene
D. Gibberellins

4. In the central nervous system, the _______ communicates
with and coordinates what happens in other parts of the brain.
A. cerebrum
B. cerebellum
C. brain stem
D. hypothalamus