You should use kilograms.
* * * * *
That is so wrong! A kilogram is a measure of mass, not of weight. Also, you would need over 300,000 ants to have a mass of 1 kilogram! The basic unit for weight is Newtons,
You could use a Newton, with scientific notation, to allow for the fact that an ant weights so little. Or a micronewton.
An ordinary household ant will weigh approx 30 micronewtons.
Millimetres or micrometers
The mass of an ant would typically be measured in milligrams (mg) or micrograms (μg).
kill it then take it to your house to eat it but first mesure it with a ruler or a meter stick, which evr one you have.
A pair of calipers or a ruler would be suitable tools to measure the size of a bull ant. Make sure to handle the ant carefully during measurement to avoid any harm.
An ant's small size and low mass result in a low terminal velocity compared to larger, heavier objects. This means that the ant does not reach a speed that would cause harm upon impact with the ground. Additionally, the ant's exoskeleton provides some protection by absorbing the impact forces of the fall.
meter
For an ant farm, I would suggest a kilogram. For an individual ant, a milligram.
3 milligrams is the weight of an average ant.
Millimetres or micrometers
The best unit for measuring the length of an ant is millimeters or centimeters. The ants are too tiny and the smallest unit of measurement would be ideal for them.
cenimeter
A millimetre.
i would use mm that is te best metric measurment you would use
The mass of an ant would typically be measured in milligrams (mg) or micrograms (μg).
length
length
length