Why does the water in the canals of Venice look clearer?

Nobody is using them.

Explanation:

Normally, Venice uses its canals as a main form of transportation, through boats. However, with the whole city on lock down, nobody can use the canal, so it doesn't get clumped up and polluted

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.