Poliomyelitis is an RNA virus that can invade the nervous system and cause paralysis within a matter of hours. Polio has been virtually eliminated world-wide by which of the following?
a. Antibiotics
b. Vaccination
c. Mosquito control
d. Quarantine
e. Improve water quality
b. Vaccination
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Four of the five choices listed below are parts of a
leaf. Select the exception. a. stoma b. cuticle c. mesophyll d. node e. petiole
Habitat is best described as:
a. the local environment in which a species lives. b. what a species eats. c. what competes with a species. d. the abiotic components of a species' environment. e. the totality of adaptations by a species to its environment
If you (incorrectly) proposed that tundra, the world's largest land biome, contains high species richness, your proposal would be consistent with the
A. species-time hypothesis. B. species-area hypothesis. C. species-productivity hypothesis. D. diversity-stability hypothesis.
Thick, closely packed skin cells that are shed to remove microbes are called
A) Epithelial cells B) Endothelial cells C) Keratinocytes D) Sweat glands