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Give two important reasons why there is so much more Na+ in the oceans than K+, despite their similar abundances in the earth's crust.
Brain Activity
The electrical and chemical processes occurring within the brain that enable thought, perception, and other neurological functions.
REM Sleep
A stage of sleep characterized by rapid eye movement, increased brain activity, and vivid dreams.
Nightmares
Disturbing dreams that can cause feelings of fear, terror, distress, or anxiety, often leading to awakening.
Anxiety
A sensation of apprehension, tension, or disquiet, frequently related to an upcoming occurrence or a situation with an unpredictable result.
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