Question

how microorganisms are harmful to us give at least three points​

Answer 1

Answer:

1. A few harmful microbes, for example, less than 1% of bacteria, can invade our body (the host) and make us ill.
2. Microbes cause infectious diseases such as flu and measles.  
3. Different diseases are caused by different types of micro-organisms. Microbes that cause disease are called pathogens.

Explanation:

Hope it helps u... :)