Question

Bacteria are both useful and harmful to mankind

Answer 1

Bacteria is harmful as well as useful to mankind
Bacteria causes very harmful diseases to man and in the same way it is helpful in preparation of medicines.
Penicillin the first antibiotic was from bacteria
It also helps in preparing curd from milk
In this way it is useful in many ways
And also harmful

Answer 2

Answer:

Bacteria is harmful as well as useful to mankind Bacteria causes very harmful diseases and spoilage of foodstuffs but it is helpful in preparation of medicine and in agriculture.