What did the romans build as a step toward environmental management? the romans built to carry water from abundant water areas to areas with high chances of drought. they also built an enormous system to remove waste and create farmlands.

The Romans built the aqueducts, which were an important part of their water system.

Aqueducts

Explanation:

The aqueducts where gigantic and long constructions that carreid fresh water from the surroundings to the cities, and they also carried out of the cities the waste that the human activities generated, this was one of teh greatest inventions and contributions to human kind, they were replicated all over the world because of its great use and comodity.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).