A food web is a more realistic depiction than a food chain because:a
organisms rarely eat just one kind of food.
b. energy flow is linear.
c. energy flow is cyclic.
d. a more complex model is always better than a simple one.
e. matter cycles in ecosystems
a
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Which of the following is a desirable general characteristic of antimicrobial drugs?
A. Broad-spectrum of activity B. Bactericidal rather than bacteriostatic C. Selective toxicity D. All of the choices are correct.
Most North American outbreaks of Cyclospora cayetanensis have been associated with
A. cattle. B. iguanas. C. imported leafy vegetables and berries. D. chickens.
______ cells are made during mitosis, but _______ cells are made during meiosis.
a. Somatic; diploid b. Haploid; gamete c. Somatic; haploid d. Haploid; diploid
The tough, fibrous sac that surrounds, protects and lubricates the heart is the
a. myocardium. b. epicardium. c. endocardium. d. pericardium. e. trabeculae carnae.