Answer:
A normal line
Explanation:
"In geometry, a normal is an object such as a line, ray, or vector that is perpendicular to a given object."
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when an animal is thirsty, it responds by drinking water
A coral reef is a complex [ecosystem] of calcium carbonate shells that are home to microbes, algae, invertebrates, and fishes, and its high productivity helps provide great species richness.
Hyperkalemia, depolarization
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