The following is true about inhalants:
a. doses vary because of individual lung capacities.
b. they reach the blood stream within 10 mins after inhalation. c the products used are illegal for purchase by minors.
d. effects last for days

b is the best answer for this question.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

satellites are frequently used to make observations of the orbit on earth