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Infinitely many. Each point on the circumference of a semicircle can be one end of a diameter and there are infinitely many points in a line segment of any length.
12 costumes.
They were all made many, many, many, years ago. I think a few million maybe each, maybe more. One thing I forgot to mention, they're all made by small rock particals, and none of them are any shape execpt oval or round.
There can only be one full group. But if your question is like this, " If there are 5 kids, how many buses do you need? Each bus can hold 4" the answer would be two.