Question

At the heart of all vehicle exists a
power source, who is an internal
combustion engine. On a Hybrid car
though as the name suggested, there is a
combination of power sources. A power
of the engine vary according to
their size. A bigger one might be more
powerful, but it also guzzles many fuel.​

Answer 1

Answer:

at the heart of all vehicles exists a poet source which is an internal combustion engine.

on a hybrid car though as the name suggests, there is a combination of power sources.

the power of the engine varies according to their size

Answer 2

Answer:

At the heart of every vehicle exists a power source, which is an internal combustion engine. In a Hybrid car though, as the name suggests, there is a combination of power sources. The power of the engine varies according to its size. A bigger one might be more powerful, but it also guzzles more fuel.