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

the author is showing that it is the insatisfaction of basic needs that brings about the protests such as the strikes.if workers do not earn enough to buy food and feed their families and themselves in order to continue working, what is the use of working? besides, another message from the author is that of the owners of factories should be worried about ensuring their furure by having a second and third generation of workers in their industries.if they do not hear the workers demands, they will not have any more workers to make their pockets full.