Examlex
The _______ system, which is most active during periods of calm, helps return the body to resting conditions.
Atoms
The basic units of matter, consisting of a nucleus surrounded by electrons.
Nitrogen
A colorless, odorless, nonmetallic element that makes up about 78% of the Earth's atmosphere and is a constituent of all living tissues.
Calcium Chloride
A salt compound often used for ice melting, dust control, and as a desiccant because of its ability to absorb moisture.
Formula
A representation of the composition of molecules and compounds using symbols for the elements.
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