Question

describe two things that are harmful explain why you consider them harmful how can you prevent them

Answer 1

first - half knowledge of anything is very
harmful
and second- questioning with half the information given is also very harmful

Answer 2

1- Wasting time. Once it is gone, it will never gonna return. You can't catch it, hold it or fold it; so be still and walk accordingly in the flow. Everyone in the universe has as much of time as you, which means, you can do anything that other person can do or achieve.

2- Pollution. From water, air to food, everything is getting polluted, everything is getting contaminated with harmful particles, air and things. Do participate in program like Swaksha Bharat Abhiyaan and clean your surroundings. Make sure there be no harm to nature by you. Plant some trees , prefer walking for short distance and public vehicle for long. Stop using plastic and make a modified future for generations.