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What condition of smooth muscle allows it to maintain contraction for long periods of time?
Trophic Level
A step in a food chain or food web, representing the position of organisms in the flow of energy through an ecosystem.
Percentage
A mathematical term representing a fraction of 100, used to describe proportions or ratios.
Fresh Water
Water that contains minimal amounts of dissolved salts, especially found in lakes, rivers, and streams, as opposed to salt water.
Groundwater
Soil water and water in aquifers.
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