An insect bite on the face produces a break in the skin which introduces the normal skin flora (usually <em>Staphylococcus </em>and <em>Streptococcus</em>) to the sterile subcutaneous tissue causing inflammation. The inflammation of the subcutaneous tissue is called cellulitis. Since the infection is in the face, then it can travel from the infected site to the meninges through the cavernous sinuses and cause bacterial meningitis.
Where organisms are better adapted to their environments tend to survive and produce more kids!
Antibiotics are usually derived from bacteria.
I'm not completely sure, but I'd say D.
1.rivers and streams
2.seepage from the ground