Examlex
The ____ ion is required for ribozymes to become active and begin self-replication.
Body's Arousal
The state of being physiologically alert, awake, and attentive, often as a response to external stimuli or excitement.
Physiological Differences
Variations in the biological functions or structures among individuals or groups.
Epinephrine
A hormone and neurotransmitter also known as adrenaline, involved in the fight-or-flight response of the sympathetic nervous system.
Arousal
A physiological and psychological state of being awake, alert, and engaged, often associated with increased heartbeat and energy.
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