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In the embryo, the bones of the arms and legs are first made of:
Two-Factor Theory
A psychological theory proposing that emotions are composed of two factors: physiological arousal and cognitive interpretation.
Physical Arousal
The bodily response to stimuli, characterized by increased physiological activity, including heart rate, blood pressure, and energy levels.
Sympathetic Nervous System
Part of the autonomic nervous system that prepares the body for physical activity by triggering the "fight or flight" response.
Salivation
The involuntary production of saliva in the mouth, which can be stimulated by the anticipation of food or the presence of something to chew.
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Q203: The number of pairs of each type
Q243: There are _ pairs of lumbar spinal