The harmless whale shark cruises slowly through the tropical oceans. It eats by filtering tiny floating animals (plankton) from the water. It is a peaceful creature, although, at 50 feet (15 m) long, it’s the biggest fish of any kind.
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To filter means to clean a substance or remove its impurities by passing it through something.
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“m” is an abbreviation for meter, a metric measurement of length that is equal to 100 centimeters. One meter equals 39.37 inches, or 3.28 feet.