Which issue is not caused or transmitted by an insect?
a. schistosomiasis
b. reduced lumber harvests
c. significant damage to food crops
d. typhus
e. malaria
a
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Which of the following toxins contributes to the virulence of B. pertussis and works by hemolyzing red cells and activating cyclic adenosine monophosphate, which inactivates several types of host immune cells?
a. Endotoxin b. Pertussis toxin c. Tracheal cytotoxin d. Adenylate cyclase toxin
Which are tetrapods? Check all that apply.
_____ frogs _____ snakes _____ birds _____ humans _____ lungfish
For acid rainwater, which has a pH as low as 3.0, which of the following is true?
a. [H+] < [OH?] b. [H+] = [OH?] c. [H+] = 0 d. [OH?] = 0 e. [H+] > [OH?]
Science differs from other disciplines, such as history and the arts, because science relies on
A) observations. B) theories. C) facts. D) testing explanations.