Helium gas is collected over water at 25 C. What is the partial pressure of the helium. given a barometric pressure of 770 mmHg?

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.

b

explanation:

mitosis

i'm assuming that the correct answer is indeed the first one/ "a"..

answer; talc and gypsum;