Oxygenated blood from the lungs is received by the
a. left ventricle
b. right atrium
c. left atrium
d. right ventricle
Ans: c. left atrium
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What happens when action potentials stimulate a muscle at a rate that does not allow relaxation between contractions?
A. The strength of contraction decreases with subsequent stimuli. B. The strength of contraction increases with subsequent stimuli. C. The strength of contraction does not change. D. More motor units are recruited.
P700 is located in photosystem ____ and is comprised of chlorophyll ____
a. I; b b. I; a c. II; b d. II; a e. I and II; a
Linnaeus believed that species remained fixed in the form in which they had been created. Linnaeus would have been uncomfortable with _____
A) a hierarchical classification scheme B) taxonomy C) phylogenies D) nested, increasingly inclusive categories of organisms
How do the seeds of angiosperms differ from those of gymnosperms?
What will be an ideal response?