Give two ways in which bacteria are useful to us and two ways in which they are harmful?

Answer and explanation:

Usefulness of bacteria:

- Many food products include 'good' bacteria such as yogurt, cheese, etc.

- They break down waste material so our environment would not be in full of trash

Harmful bacteria:

- Some bacteria can cause bad affect to our lives, is a threat to our health

- They make food cannot stay long, spoil foods.

Hope this helped you :3

I think I do

Explanation: