Answer:
vassals
Explanation:
A king (or lord) ruled large areas of land. To protect his land from invasion, the king gave parts of it to local lords, who were called vassals. In return, his vassals promised to fight to defend the king's lan
Answer: B) sympathetic nervous system
Explanation: The sympathetic nervous system is a section of the automatic nervous system in the body that reacts to stressful or dangerous situations by stimulating the fight-flight-or-freeze response. This causes the body's alertness to increase as well as increase in the rate of heartbeat.
Some of the visible symptoms includes Hypertension, Agitation. Muscle rigidity, Heavy breathing etc.
The fact that the individual didn't study for the exam he or she is writing puts the individual in a stressful position, that is why his or her sympathetic nervous system kicked in to stimulate the body's fight-flight-or-freeze response, causing the individual's rate of heart beat to increase as well as having dry mouth.
The correct answer is the placebo effect causes brain changes.
Explanation: Placebo effect is the measurable or observable effect on a person or group who has been given a placebo treatment. Many believe that the placebo effect is psychological, due to a real effect caused by belief or subjective illusion.
