Answer these Questions.

Questions for all.
If you have the answers, please mail them. Correct ones shall be published with the name of the contributor.

1. Why do we feel pressure when we enter a tunnel while travelling in a train?

2. Do ants, earthworms, cockroaches have blood circulation system like vertebrates with hearts and blood vessels?

3. How do trees help control noise pollution?

4. Even when both the parents are Rh positive, children born to them can be Rh negative. How does this happen?

Mail your answers to: muzamilmasood@gmail.com