All chemical reactions use reactants in a specific proportion or stoichiometry to regulate the amount of products produced. The reactant is consumed completely during the reaction but some of the reactant is left over. a. limiting, excess
b. excess, limiting
c. proportional, ideal
d. chemical, stoichiometric

Ais the correct answer

Because it was a dramatically big guy

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant. 

The water cycle increase the water content in the earth atmosphere