Top 100 Riddles and Brain Teasers 76 to 80

Riddle 76:
The more of them you take, the more you leave behind. What are they?
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footsteps

Riddle 77:
Name three keys that unlock no doors.
Solution:
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Donkey, Monkey, Turkey

Riddle 78:
What word looks the same upside down and backwards?
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SWIMS

Riddle 79:
I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole,
What am I?
Solution:
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A snake

Riddle 80:
What kind of room has no windows or doors?
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Mushroom