Answer:
c. REM sleep
Explanation:
Normal sleep is made up of two phases, first one ir non-rapid eye movement (NREM) sleep, and the second one is rapid eye movement (REM) sleep. This two alternate and that makes a cicle; each cycle consists of NREM sleep followed by REM sleep. REM sleep start at 90 minutoes of sleep.
REM slep have chemical and electrical activities that regulate it, during this phace the brain have abundance of the neurotransmitter acetylcholine, combined with lack of monoamine neurotransmitters histamine, serotonin and norepinephrine. Some studies theorize that this make REM sleep involved in the functions of memory, however, there is not enough information to ensure that memory depends on REM sleep.
Typically between the ages of 9 and 12 or what many consider late prepubest and early puberty
Answer:
Calcium
Explanation:
The mineral calcium helps your muscles, nerves, and cells work normally. Your body also needs calcium (as well as phosphorus) to make healthy bones. Bones are the main storage site of calcium in the body. Your body cannot make calcium.