What metric units of mass are used to measure the following :

a. Grasshopper b. Mouse c. Truck
d. Dog

So the dog and truck would be measured in tonne

I'd measure a dog in kilograms.

https://www.google.com/search?q=50+lbs.+kg&enablesearch=true

I suppose:

a. milligrams
b. grams
c. tonnes
d kilograms

HOWEVER, I measure all masses in kilograms, SI unit of mass. https://en.wikipedia.org/wiki/International_System_of_Units

Whoever wrote this question is not a physicist.

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To measure the mass of different objects, we typically use the metric system, which is widely used around the world. The metric system has a base unit for mass called the kilogram (kg). However, for smaller or larger objects, we often use different units to express mass. Let's determine the metric units commonly used to measure the mass of the given objects:

a. Grasshopper:
Grasshoppers are very small, so their mass is usually measured in milligrams (mg) or grams (g). Both milligrams and grams are smaller units of mass compared to a kilogram.

b. Mouse:
Mice are also relatively small, but slightly larger than grasshoppers. Therefore, you might measure the mass of a mouse in grams (g) or sometimes even in kilograms (kg).

c. Truck:
Trucks are much larger and heavier than grasshoppers or mice, so the appropriate unit to measure their mass is usually in metric tons (t) or sometimes in kilograms (kg). Metric tons are a larger unit of mass compared to kilograms.

d. Dog:
Dogs can vary in size, so the unit to measure their mass will depend on the dog's size. Smaller dogs might be measured in kilograms (kg), while larger dogs might be measured in metric tons (t).

Remember, if you need to convert between metric units of mass, you can use conversion factors. For example, 1 kilogram (kg) is equal to 1,000 grams (g), and 1 metric ton (t) is equal to 1,000 kilograms.

https://www.chartmedia.co.uk/poster-metric-units-measurements-length-time-volume-temperature-mass