Within the mollusks, only the cephalopods have a
A) hinged shell.
B) closed circulatory system.
C) tubular gut.
D) radula.
E) coelom.
B
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A cohort study looks at
A) a large group of people over time, keeping track of specific health conditions or measures. B) large groups of DZ and MZ twins. C) heritabilities of behavioral characteristics. D) patterns of copy number variants in the human genome.
Which of the following is an example of a density-independent regulation?
a. parasites b. waste accumulation c. hurricanes d. predation
Which of the following is primarily responsible for cell elongation, gravitropism, and apical dominance implants?
A. Auxin B. gibberellin C. Cytokinin D. Phytochrome E. ethylene
Humans become infected with Toxoplasma gondii primarily by
A. being bitten by a tick. B. direct skin penetration. C. ingesting food or water contaminated with cysts. D. ingesting meat containing the parasite. E. intimate contact with another person.