Answer:
Adenovirus. Both respiratory and enteric human adenoviruses (HAdV) are found in water, cause waterborne disease andare present at a higher frequency in sewage than other enteric viruses.
Usually if a girl becomes pregnant while still in her teenage years, it gives a higher chance of premature deliveries.
The answer to your question should be the last option intrinsic factors
They're behavior might be a little different. Im not 100% sure but this is what I think
