Carla is three-and-a-half weeks pregnant. This indicates that her child is in the ________ period of prenatal development.
A. embryonic
B. germinal
C. fetal
D. placental
Answer: A
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Spinal neurons that pass motor information to the body's muscles may be found in _________ of the spinal cord.
A. the white matter B. the dorsal horns C. the ventral horns D. both the dorsal and ventral horns
The wavelength of light determines the psychological dimension of ________
Fill in the blank with the appropriate word.
Compared to children and adults, adolescents
A. perceive fewer risks on laboratory questionnaires. B. make more deliberate decisions in the real world. C. are less likely to make a cost-benefit analysis of risks. D. engage in a greater number of risky behaviors in the real world.
Muscle activity is coordinated in the primitive brain structure called the ______.
a. pons. b. cerebellum c. medulla oblongata d. thalamus