Grams and kilograms are measurement of weight. For a letter you would use grams. For a package you would use kilograms as it weight is more.
I would use grams because grams would give you more significant figures for the measurement than kilograms
Probably use kilograms, they're bigger than pounds. Most other countries use kilograms. Example: I weigh 120 pounds, which means I also weigh 54 kilograms.
You can use either. If you use kilograms, you will probably get a decimal, less than 1, so grams would be commonly used. By the way, grams and kilograms are units of mass, not of weight.
paper clips do not weigh much, perhaps a gram each, so 10 weigh about 10 grams, so you would use grams, not kilograms, since 1 kg = 1000 grams
You could (theoretically) use either... However - Kilos is the preferred measurement.
Grams and kilograms are measurement of weight. For a letter you would use grams. For a package you would use kilograms as it weight is more.
grams
I would use grams because grams would give you more significant figures for the measurement than kilograms
Probably use kilograms, they're bigger than pounds. Most other countries use kilograms. Example: I weigh 120 pounds, which means I also weigh 54 kilograms.
You can use either. If you use kilograms, you will probably get a decimal, less than 1, so grams would be commonly used. By the way, grams and kilograms are units of mass, not of weight.
paper clips do not weigh much, perhaps a gram each, so 10 weigh about 10 grams, so you would use grams, not kilograms, since 1 kg = 1000 grams
There are 1000 grams in a kilogram, and seeing how small a butterfly is, I'd use grams
As far as I can tell there is no such thing as a canalop! So it does not matter whether you use grams or kilograms - the measure will be zero in either case.
Kilograms are used to measure weight, while liters are used to measure volume. To weigh a squirrel accurately, you would use kilograms or grams.
You can just use a set of weigh scales.
It does not matter, kilograms or grams. A baby may weigh 3750 g or 3.750 kg both are used, that is the ease of use of the metric system.