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