When you feel threatened, the
neurotransmitter, ___, is released from ___
neurons and your response is to fight or flee.
a. acetylcholine--sympathetic
b. acetylcholine--parasympathetic
c. norepinephrine--sympathetic
d. serotonin--sympathetic
e. serotonin--parasympathetic
C
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Animal viruses are divided into a number of families whose names end in
A. -virus. B. -viridae. C. -viscous. D. -eieio.
Which ponds contained both cichlids and killifish as predators?
a. primero, segundo, and quarto b. segundo, quarto, and quinto c. tercero and septimo d. quinto and sexto e. none of the above
The ________ is a group of plant and animal species that inhabits a given area
Fill in the blank(s) with correct word
Cutting down large areas of tropical rain forest increases atmospheric CO2 in two ways. One is that rotting and burning trees directly add CO2 to the atmosphere. What is the other reason CO2 increases?