The earliest nervous system likely resembled a:
A. nerve cord.
B. ganglia.
C. simple brain and nerve cord.
D. nerve net.
D
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The active site of an enzyme is the region that _____
A) binds allosteric regulators of the enzyme B) is involved in the catalytic reaction of the enzyme C) binds noncompetitive inhibitors of the enzyme D) is inhibited by the presence of a coenzyme or a cofactor
Adult zebra mussels are __________, and they are __________ when in the early stages
a. invisible; invisible b. invisible; visible c. visible; invisible d. visible; visible
The ovarian cycle includes the ____ phases
a. luteal and secretory b. menstrual and proliferative c. follicular and luteal d. follicular and proliferative e. proliferative and secretory
Overexploitation occurs as a result of ____
a. harvesting of predators b. transformation of an ecosystem to a desert c. soil nutrient loss
d. the combined outcome of desertification and global warming e. excessive harvesting of an animal or plant species