Question

what is law of conservation of mass
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Answer 1

Answer:

In physics and chemistry, the law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed..

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Answer 2

Q4 While learning to ride a bicycle Boojho lost his balance and

fell. He got bruises on his knees and it started bleeding.

However, the bleeding stopped after some time.

(a) Why did the bleeding stop?

(b) What would be the colour of the wounded area and why?

(c) Which type of blood cells is responsible for clotting of blood