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Which of the three phases of matter (solid, liquid, or gas) features particles in a fixed, rigid arrangement?
Concepts
Abstract ideas or general notions that exist in the mind as representations of categories or classifications of objects, events, or relations.
Permeable
describes a material or membrane that allows liquids or gases to pass through it.
Sodium Ions
Positively charged atoms of sodium that play critical roles in the body, including regulating blood pressure, fluid balance, and nerve function.
Cerebrospinal Fluid
A clear, colorless body fluid found in the brain and spinal cord, acting as a cushion for the brain's cortex, providing basic mechanical and immunological protection to the brain inside the skull.
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