<span>For an outbreak of a waterborne disease to occur, a large number of people must get sick from the water source. </span><span>an outbreak needs a group of people, a large enough group of people, to get sick and at least some of them to seek some kind of medical care so that the cause could be identified. </span>
The bubbles of beer
I may be wrong pls double check
I think at 7-8 week of development this happens
Ionic bond is the correct answer