Abby is 5 feet tall and casts a 4 foot long shadow of her older brother Ethan is standing next to her and casts a 4.6 shadow how much taller than Abby us Ethan

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.

d) physical means can be used to separate the components of air.

that would be because of both gravity and friction. so     c

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 =