The systems of internal combustion engine

What is the role of a carburettor in a gasoline engine?

How is the fuel-air mixture delivered to the engine in a gasoline engine equipped with a carburettor?

In a diesel engine, what component forces the fuel into the combustion chamber?

What is the purpose of lubrication oil in an internal combustion engine?

How does lubrication oil reduce friction between working surfaces?

What type of pump lubricates the engine in the provided information?

Where are the inlets of the gear-type pump located?

How is oil delivered to the camshaft bearings and crankshaft main bearing?

What causes the downward movement of water in the radiator of an engine's cooling system?

Besides the cooling system, what other system is mentioned in the provided information?