Imagine that you live in a city near a large river you are part of a group that is studying the environmental impact of switching your City from fossil fuels to hydropower which two issues are possible consequences that you should consider
A: harm to fish and other organisms in the river
B: danger to birds that live in your region
C: decrease in carbon dioxide production
D: toxic waste created by nuclear reactions

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. 

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