4. Penseu i digueu un canvi físic que tingui lloc relacionat amb aquest fenomen. Justifiqueu per què es tracta d'un canvi físic.

the answer would be c

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement

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 =