1. Gram-Positive Bacteria
Actinomycetes: Gram-positive bacteria that form branching filaments; used to make antibiotics.

2. Pros Used in sewage treatment
Decomposers, breaking down the remains of organic matter in dead plant & animal waste
Recyclers, returning nutrients back to the environment
Food production: Bacteria help us make buttermilk, sour cream, yogurt, some cheese, sauerkraut and pickles

3. Pros Industrial chemical production
Help clean up environmental disasters caused by humans, such as chemical & oil spills
Useful in genetic engineering (gene splicing) to produce medicines and drugs.

4. Cons Spoil food Cause odor Some cause illness/disease, death
"Toxins" substances released by bacteria the make you ill