Kilograms.
You would use kilograms (kg) to measure someone's mass in metric units.
No, millilitres is a measure of volume not mass. You would use milligrams.
The mass would not change, only the numbers describing the amount of mass would change.
Mass and weight are two different things: you cannot measure the mass of your weight. That is like talking about the temperature of your height - it makes no sense.
Meters for height Kilograms for mass.
We have no idea how one would measure length in mass units.
Grams or ounces would probably be the best choices.
English units of mass include the poundmass, the poundal, and the slug.
The measurement with the greatest mass would typically be in kilograms or grams, as these are units used to measure the mass of objects.
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Grams
Matter isn't really something you can measure. To measure mass, you would use a balance.