The Brainliest Answer!
1. Pasteur came up with "germ theory of disease" and invented vaccines. He also invented pasteurization to make food safe without destroying the food. Koch proved the "germ theory of disease." Lister discovered anesthesia to help with surgical procedures.
2. Virus: the flu
    Bacteria: Strep throat
    Protist: Trypanosoma
    Fungi: Athletes Foot
3. STD's are sexually transmitted diseases. How they are contracted is self explanatory, and treatment varies based on the type, but antibiotics, or penicillin are the most common treatments. They are easier to prevent than they are to treat.

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Std is a diseases you get by unprocted sex hope this helps