Sensory neurons release glutamate and neuropeptides such as ____ to enhance the effect of glutamate
a. GABA
b. substance P
c. serotonin
d. norepinephrine
e. epinephrine
b
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After the stage IV of the demographic transition, birth rates
A. are lower than death rates. B. equal 2 ? death rates. C. are higher than death rates. D. equal death rates. E. None of these choices are correct.
In a 3-D double helix model of DNA, the center consists of ____
a. deoxyribose sugars b. hydrogen bonds c. nucleotide base pairs d. phosphate groups e. sugar–phosphate backbones
Which of the following is one of the main locations for the type of tissue in Figure 39-1?
a. lining of the digestive tract b. within blood vessels c. dermis of the skin d. respiratory passages e. air sacs of the lungs
The age structure diagram of a human population in a developed country like Sweden, which has a population growth rate near zero and in which neither the birth rate nor the death rate has changed much in the recent past, has the shape of
A) an hourglass. B) a pyramid. C) a rectangle tapering near the top. D) a funnel. E) a triangle with the point at the bottom.