The American colonies import the least amount of tea from 1774-1775, explain why this occurred.

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).

the area between the graph and the t axis

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge

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 =