One characteristic that appears to be innate in human beings is ________
a. strong eyesight.
b. a fear of new things.
c. an understanding of numbers.
d. leadership qualities.
Answer: c
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The placenta
A) forms in the second trimester of pregnancy. B) encloses the developing organism in amniotic fluid. C) contains one large vein that delivers nutrients to the embryo. D) delivers food and oxygen to the developing organism.
When a neurotransmitter molecule binds briefly with a receptor site, changes occur in the receiving neuron's charge. If there is a voltage shift in a negative direction, then the effect is:
a. inhibitory, and so the probability that the receiving neuron will fire decreases. b. excitatory, and so the probability that the receiving neuron will fire increases. c. inhibitory, and so the probability that the receiving neuron will fire increases. d. excitatory, and so the probability that the receiving neuron will fire decreases.