Which is a substance that can be separated by physical means and is not the same throughout

carla slowed down in the beginning of her trip, stopped, and then sped up

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.

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 =