In humans, oxygen is delivered to the cells of the body by ________

A) a closed circulatory system
B) an open circulatory system
C) diffusion
D) diffusion and facilitated diffusion


A

Biology & Microbiology

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Which stage of development involves initial

cellular reorganization? a. gamete formation b. fertilization c. gastrulation d. organ formation e. tissue specialization

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Ecologists determined that, regardless of the richness

of the ecosystem, energy passes through no more than __________ trophic levels. a. one or two b. two or three c. three or four d. four or five e. five or six

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The vestibular canal contains __________, while the cochlear duct contains __________

a. endolymph; perilymph b. tympanic membrane; organ of Corti c. organ of Corti; endolymph d. perilymph; endolymph e. scala media; endolym

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Which of the following is part of the structure of the mitochondria of a eukaryotic cell?

A) cilia B) cristae C) thylakoids D) inclusions E) nucleolus

Biology & Microbiology