First, what is a fossil? When an organism
(living thing) such as a plant or animal dies, it
lies on the ground. Over time it is buried in rock
and it can be preserved and we call the rock
remains a fossil. Let's talk about what
factors DO affect fossilization.
1-- the type of organism. Hard things like
bones and wood are easier to preserve than soft
things, like skin or hair. That means that
you're more likely to find the fossil of a snail
than a slug.
2-- the type of rock it's in. Some types of rocks,
like shales and mudstones, preserve fossils
better than other rocks.
3-- how hot the rocks get.Sedimentary rocks are
a great place to find fossils. But if a
sedimentary rock is heated, and metamorphosed, the
heat will usually destroy the fossils.
Now onto what DOES NOT affect a fossil. Things
like the age of the organism, the organism's
diet, style of movement (walking or swimming) do
not affect how it fossilizes.