The first panel of the sequence in Figure 52-2 reflects:
a. trial-and-error.
b. negative reinforcement.
c. an irrelevant stimulus.
d. the conditioned response.
e. the unconditioned response
E
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Monocots and eudicots differ in how xylem and phloem are distributed in ground tissue, in the number of petals in
flowers, and in the number of ____________________. Fill in the blank(s) with the appropriate word(s).
The micropyle is ____
a. the mature male gametophyte b. the inner seed coat c. a small opening at one end of an ovule d. a passageway through the style for sperm e. the eight-cell stage of a plant embryo
Blood leaving the efferent arteriole enters the ____________________. Fill in the blank(s) with the appropriate word(s)
Which chamber of the heart receives the deoxygenated blood from the systemic system first?
A) left ventricle B) left atrium C) right atrium D) right ventricle