In the respiratory tract, ciliated cells constantly sweep mucus that contains trapped foreign matter
a. True
b. False
ANSWER: True
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How many weeks does prenatal development
last in humans?
a. 31 b. 38 c. 40 d. 45 e. 52
Which enzyme is used in medicine as a blood thinner?
A. Rennet B. Streptokinase C. Protease D. Cellulase E. Hemolysin
Amniotic eggs evolved as a means to
A. protect the embryo while the parent sits on the egg. B. protect the embryo from predators. C. prevent the embryo from drying out. D. allow the parent to gather food, not sit on the nest.
Evidence that black walnut trees exhibit allelopathy includes
A. the morphological changes that occur in response to pathogenic attacks. B. the lack of vegetation growing under black walnut trees. C. the death of hornworms that try to eat black walnut leaves. D. the symbiotic relationship the trees have with fungi. E. the ants that protect the trees from herbivory.