22 Select the correct answer.
Which type of wall would make the best soundproofing for room?
A
B.
1.0 centimeter thick glass
two layers of 0.5 centimeter thick glass with 0.5 centimeters of air between them
two layers of 0.5 centimeter thick glass with 0.3 centimeters of vacuum between them
OC
OD
1.0 centimeter thick steel
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vapour or gas assuming atmospheriv pressure

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =

friction

explanation:

they us to move forward and backwards

explanation:

to push or pull an object in a certain direction is known as force. a force in moving an object from one place to another.

force depends on the mass of an object. so, more is the mass of an object more will be the force required to move the object.

thus, we can conclude that the use of force to move an object is push or pull.