An organism's is its position in the food chain, relative to the ecosystem's energy source.
A. keystone level
B. climax level
C. trophic level
D. habitat
E. niche
C. trophic level
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Xylem transports _______, whereas phloem transports __________
A. sugars; starch B. water; sugars C. water; minerals D. sugars; water E. sugars; minerals
According to the plate tectonics theory, Earth once consisted of a single, large landmass named
A. Gondwana. B. Laurasia. C. Pangaea. D. Panthalassa. E. Ultima Continenta.
Class I MHC genes code for
A. certain secreted complement components. B. receptors located primarily on macrophages and B cells. C. self receptors recognized by T lymphocytes. D. all HLA antigens.
What statement below characterizes pigments’ function?
A. They absorb some photons. B. They reflect all photons. C. They absorb photons of all colors. D. They absorb photons of all wavelengths. E. They absorb ultraviolet wavelengths.