Donna is attempting to make an electromagnet to pick up old nails in and around her driveway. which of these materals would be best to use the core in order to make the strongest electromagnet to pick up the most nails

you have to draw the persons position over there

muscle endurance

explanation:

i can do 50 in a row ( but i get so tired after that)

force tends to be low and long diustance masses are high

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 =