An oral contraceptive pill contains ____

a. estrogen only
b. progesterone only
c. FSH
d. LH
e. estrogen and progesterone


e

Biology & Microbiology

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The cells active in both innate and adaptive immunity develop from common pluripotent precursors in the bone marrow called

A) B cells. B) killer cells. C) stem cells. D) leukocytes.

Biology & Microbiology

Which of the following tissue types is used as the body's reserve of energy?

a. Loose connective b. Blood c. Cartilage d. Dense irregular e. Adipose

Biology & Microbiology

The atmosphere contains approximately ____ percent nitrogen. 

A. 2 B. 10 C. 50 D. 80

Biology & Microbiology

Biological magnification of persistent toxins would be greatest in a

A. fox. B. oak tree. C. polar bear. D. mushroom. E. deer.

Biology & Microbiology