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It is believed that there was a heavy bombardment of planetesimals at what stage in planetary development?
Acetylcholine
a neurotransmitter in the nervous system responsible for muscle stimulation and various brain functions.
Tetanus
A bacterial infection characterized by muscle spasms, commonly transmitted through wound contamination with Clostridium tetani.
Immune System
The body's defense mechanism against infectious organisms and other invaders through a series of steps called the immune response.
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