1000 years
Not everything will fossilize because not everything is under the right environment to do so. Animals must die in a wet place in order to fossilize.
A mammoth is more likely to fossilize than a caterpillar because a caterpillar has no hard tissue. Bones and cartilage are much more likely to fossilize.
To scare. Or to fossilize.
Bones typically fossilize the most. There are some examples of fossilized feathers and hair, but it's rare.
Amber is lithified tree sap. Small insects and animals can be preserved but not fossilised in amber.
1000 years
They don't decompose at the right rate or at the right place or at the right temperature.
fossilize
No, there are certain materials that can't be Fossilized
A clam.
A fox would be the most likely. A moth is smaller, and therefore would take less time to decompose. However, for anything to(technically) fossilize takes a very long time
mainly high pressure but you'll also need sediment such as rock or sand to smash it and as the soft parts of the plant decay they leave impressions on the rock