What type of rock is most likely to contain fossils? And why:

If limestone is subjected to metamorphism, what metamorphic rock will likely form?

What changes an igneous rock will undergo, if it changes first to a sedimentary rock and then to a metamorphic rock.

Sedimentary: The fossils are destroyed if the rocks are subjected to great heat and pressure (In the formation of metamorphic rocks). Igneous rocks are formed from molten rock and therefore has no record of fossils.

As for the other questions, it all depends on where and what happens to that rock. Check it our at

How Rocks Are Formed

Hope this helps.