The Romans invented central heating for two reasons. One, was to keep warm. This may have not been too much of a problem in southern Italy, but further north and in some of the provinces it got cold. The second reason was it was a lot safer than the open braziers commonly used to heat a room.
Concrete, Aqueducts, Baths, Central Heating and Roads.
The Romans didn't invent the microscope
The Romans invented concrete.
so that people can have a bath in hot water instead of cold water or if not heat it with fire too.
The Romans invented concrete.
The Romans invented or improved a long, long list of things, but you only asked for four, so here they are: Concrete, the Dome, Central Heating, the Taxi Meter.
No, the Romans did not invent bowls. Bowls were around for thousands of years before the Romans existd.
No
No.
No.
No.
no