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Atom economy is
Valves
Structures that allow fluid (liquid or gas) to flow in one direction while preventing backflow, found in various biological and mechanical systems.
Intestinal Contents
The material, including digesting food and bacteria, contained within the intestines.
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.
Tissues
Groups of similar cells that perform a specific function within an organism, making up organs and other parts of the body.
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