Engine oil
#2
The engine will start even if there is zero oil in the oil pan, and yes, it will cause damage.
#3
Your kinda asking a meaningless question of sorts. By not the proper amount one must assume you mean way low as in quarts. Half or even 3/4 quart down would do nothing. I know people very knowledgable about vehicles that continually run their vehicles about 1/2 quart down they like keeping the level off the full mark.
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