Hydrocarbons are organic molecules that contain only ______.
A. components found only in crude oil
B. carbon and hydrogen atoms
C. carbon atoms
D. carbon, hydrogen, and oxygen atoms
B. carbon and hydrogen atoms
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Most of the earth’s usable carbon is in its
a. crust. b. atmosphere. c. biomass. d. oceans. e. mantle.
Which virus type results in the immediate onset of cancer phenotype upon infection of a host?
A) retrovirus B) acute transforming retrovirus C) lentivirus D) adenovirus
Photosynthesizers take in carbon dioxide, whereas decomposers ________ carbon dioxide
A) yield up B) take in C) fix D) destroy
Which of the following is mismatched?
A. somatic motor nerves-smooth muscle, cardiac muscle, glands B. sensory nerves-afferent C. motor nerves-efferent D. visceral sensory nerves-body organs E. somatic sensory nerves-skin, muscles, joints, special senses