None. They can't get that high! (My band teacher told me that one today)
Only two, but you've got to wonder how they climbed up there!
Yes.
A light bulb weighs about 50g and a single ant can lift about.2g, so it takes somewhere around 250 ants working together.
Two: One to hold it one to hammer it in.
Don't worry, they'll tell you.
You pull down its genes.
