Question

why do we fall ill biology notes class 9​

Answer 1

Whenever the normal working of our body system gets disturbed, we feel sick. Infectious diseases are caused by pathogens such as bacteria, viruses, fungi and parasites entering the body through the air we breathe, the food and drink we consume or through openings like cuts.

Answer 2

Answer:

bcoz the sylabus is vast and not easy to byheart all also and to know all

Explanation:

So we just have know the concept and keep it in mind but we can't remember all . So relax yourself and try to remember everything you read and study