You should use a top pan balance or a digital balance.
You Use Atomic Mass Number
You would use the unit of measure called "kilograms" to measure the mass of an elephant.
The same unit as you use to measure any mass. The SI unit for mass is the kilogram.
No, millilitres is a measure of volume not mass. You would use milligrams.
Milligram: to measure its mass.
You would use a scale to measure the mass of a block. Place the block on the scale and record the reading to determine its mass.
You would use grams (g) to measure a flower's mass.
You use kilograms.
You would typically use kilograms or pounds to measure the mass of a sheep.
You would use grams to measure the mass of a sparrow. Kilograms are typically used to measure larger masses.
You don't use a unit of mass to measure a volume. Mass and volume are two different things. Mass is measured in kilograms. The main unit of volume in the SI is the cubic meter, but for a kettle, the liter (= cubic decimeter, or 1/1000 of a cubic meter) can be used instead.
Grams