George holds a magnet above a pile of paper clips. the paper clips move toward the magnet and stick to it before the magnet actually touches it. a magnet is surrounded by which applies a push or a pull to an object without actually touching it.

Your answer is a magnetic field

why because

A magnet is surrounded by a magnetic field, which applies a push or a pull to an object without actually touching it. The magnetic field also surrounds the electric current that creates it.

show the wavelengths of a wave. show the crests of a wave.

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 =