What occurs when someone places an ice pack on an injured ankle?

conduction causes the ice pack to lose thermal energy.
conduction causes the ankle to gain thermal energy.
cold from the ice pack is transferred to the ankle.
heat from the ankle is transferred to the ice pack.

The answer is:

Heat from the ankle is transferred to the ice pack.

The explanation:

-when the ice pack  a lower temp than the ankle , it is very cool.

- and the injured ankle has a high temp or heat

and we know that Q transfer from the object with high heat to the object with the low temp So,

Heat will transfer from the ankle to the ice pack.

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 =

answergravity;