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
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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
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
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
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