_____ is the most objective method known for acquiring knowledge.
a. Observational research
b. The scientific method
c. A pilot study
d. A case study
_____ perception is the capacity to perceive and respond to stimuli presented below the threshold of awareness.
_____, produced by the _____ gland(s), plays a role in activating the _____ nervous system.
a. Testosterone; gonads; central
b. Epinephrine; adrenal; sympathetic
c. Epinephrine; adrenal; parasympathetic
d. Progesterone; pituitary; sympathetic
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