One, but it takes 7 years.
None, because they can't change anything.
One, and ten people to stand around clapping and saying "Aww, how brave."
A light bulb weighs about 50g and a single ant can lift about .2g, so it takes somewhere around 250 ants working together.
None. cmon , they'd much rather be kept in the dark.
Getting a lifetime of bad luck from breaking a condom.