Atrioventricular valves separate:
A. the left atrium from the left ventricle and
the right atrium from the right ventricle.
B. the right atrium from the right ventricle.
C. the left atrium from the left ventricle.
D. the right and left ventricles.
E. the aorta from the left ventricle.
A
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Which zone of the ocean is found above the
continental shelf? a. abyssal b. benthic c. pelagic d. neritic e. oceanic
With regard to the cohesion-tension mechanism, "cohesion" refers to the
A) evaporation of water from the stomata of the leaf. B) attraction of water molecules for one another. C) use of water in photosynthesis, resulting in a shortage of water in the leaf. D) process of osmosis that pulls water into the root. E) tendency of water molecules to be attracted to minerals in the water.
A coliform bacterium that contaminates dairy products is _______.
A) Bartonella B) Serratia C) Enterobacter D) Proteus
Phloem of angiosperms is made up of ________ lined up end-to-end forming tubes.
A. sieve-tube members B. tracheids C. companion cells D. sieve cells