A starfish has tubular feet, which are tube-like. A snail moves on a muscular foot lubricated with slime.
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"Foot" is singular, and "feet" is plural.
One mile is 5,280 feet, so the difference is 5,279 feet or 63,348 inches.
There are 12 inches in a foot.
Your answer
foot is singular and so suggests 1 foot whereas feet is plural suggesting 2 or more feet. Though having said that, foot is often used when feet would be properly correct, eg "I am 6 foot 1 tall" should really be "I am 6 feet 1 inch tall".