PLZ help i suck at biolgy

If bacteria are much too small to see, what is one reason why can we see colonies in the petri dishes that have plenty of food to eat after only a few days?

How were royal colonies different from corporate colonies? what was the king's privy council? what role did it play in the house of burgesses? what led to the creation of the rhode island colony? how was the colony governed?

When can exponential growth happen? a: when there are limited resources b: when carrying capacity is reachedc: when there is no competition d: when the death rate is high