Why should we cover our bodies while going out in the sun?
Precautions under the sun:
We should cover our mouth and nose while coughing and sneezing.
If we put our 2 fingures on wrist we feel sensation of blood is going through arteries but why dont we feel this sensation everywhere in our body
what is the name of the cell which colour to our skin and why does our skin becomes darker in complaction when we go in sun?
Why blood does not come out when we burn our body