I would choose B. exosphere. Astronomers study outer space, planets and ect.
Answer:
200 mL
Explanation:
Given that,
Initial volume, V₁ = 300 mL
Initial pressure, P₁ = 0.5 kPa
Final pressure, P₂ = 0.75 kPa
We need to find the final volume of the sample if pressure is increased at constant temperature. It is based on Boyle's law. Its mathematical form is given by :

V₂ is the final volume

So, the final volume of the sample is 200 mL.
The buoyant force exerted by a liquid is equal to the weight of the fluid <span>displaced.</span>
Solution :
We know, resistance is given by :


Now, we know mass of wire is given by :

Hence, this is the required solution.
Choice A is the right answer! Buy at high altitude and sell at low altitude
Hope this helps :)