What are some ways bacteria can be beneficial and some ways it can be bad? (a.s.a.p)

Question

please a.s.a.p im doing a news article on bacteria and i need these soo please help? m not a lazy kid tryna get answers w.o heping lol i just need 2 submit it in the next 1/2 hour , help :\

Answer 1

In your intestines some bacteria make Vitamen K.

Bad things are Salmonella and Ecoli. Lol, sorry for all the typos.  

Answer 2

Actually, E-Coli is the bacteria in your intestines that makes Vitamin K.  It's the good kind, not the resistent strain.  It's in everyone.  There is natural flora (bacteria, fungi) all over us, that maintains a balance in our bodies and fights off invaders.  Bacteria can be used to make natural pesticides, and for medical research.

On the other hand, it causes disease, it interferes with the natural balance in our bodies (ie, yeast), it mutates easily into anti-biotic resistent strains.