Answer:
I think the answer is A) repeatedly testing the solubility at various temperatures
Explanation:
#1
<span>The rate of diffusion of a gas is inversely proportional to the square root of its molecular weight.
#2
shape, molecular weight. I don't know for sure though
#3
</span>O2, N2, Ar, H2O vapor
Neutralization is a chemical reaction when an acid and a base react with each other in regards of the quantity of each.
The kidneys are involved in the digestive system by filtering urine.
Lungs are part of the <u>respiratory system</u>, the stomach is part of the <u>digestive system</u>, and the heart is part of the <u>circulatory system.</u>
Hope this helps!!
