This is because igneous and metamorphic rocks are created under extreme heat and pressure, and very few fossils would survive those conditions. The most common forms of fossils are those found in sedimentary rocks.
Igneous rocks and most metamorphic rocks, of an igneous origin.
Metamorphic rocks do not typically contain fossils, as the intense heat and pressure involved in their formation often destroy any remnants of organic matter. Igneous rocks are formed from molten material and do not contain fossils. Sedimentary rocks, which form from the accumulation and compression of sediments, are the type of rock that commonly contain fossils.
the fossils would be turned into another rock if it was in a metamorphic rock or igneous rocks. it requires a blanket of sediment
There is currently no confirmed evidence of fossils on Mars. Sedimentary rocks are usually associated with the formation and preservation of fossils on Earth, so if fossils were to be found on Mars, they would likely be in sedimentary rocks.
The fossils will be crushed under the pressures required to create metamorphic rocks and they will melt in the heat required to make igneous rocks.
Fossils abound in sedimentary rock, you are in fact very likely to find them there.
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Igneous rock is formed by the cooling of magma - liquid or molten rock. Fossils won't be found in there for obvious reasons. We don't even bother to look for fossils in something like, say, basalt, which is an igneous rock. A link is provided to the Wikipedia article on igneous rock.
Metamorphic rock becomes igneous rock when it is melted, then solidifies.
A metamorphic rock can become a igneous rock by melting and cooling
Animals are not preserved as fossils. Fossils are imprints of the organism where the body has been replaced by rock minerals. They are most usually found in sedimentary rocks, occasionally in metamorphic rock but never in igneous rock.
Any metamorphic rock can melt and recrystallize and become an igneous rock.