A very large balance
The answer will depend on what aspect you wish to measure: its length, thickness, its mass or some other aspect.
Ideally kilograms or tons.
Grams
i would use kilograms
You would use the unit of measure called "kilograms" to measure the mass of an elephant.
Kilograms would be used to measure the mass of an elephant.
A ton for a rough and ready measure. A tenth of a ton (100 kilograms) if you were a biologist following the elephant's development in more detail.
A very large balance
Any of them really. But most would use the kilogram
The answer will depend on what aspect you wish to measure: its length, thickness, its mass or some other aspect.
The best SI unit to measure the mass of an elephant is the kilogram (kg).
You Use Atomic Mass Number
yards or meters
You would use grams (g) to measure a flower's 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.
No, millilitres is a measure of volume not mass. You would use milligrams.