ANSWER:
Fossils take a lot of time to form because the decay of organisms takes long time. Organisms decompose quickly when they are exposed to oxygen and so it is not easy to get their fossils.
EXPLANATION:
- To get fossils, organisms must be buried deep so that they decay. When an organism gets eaten by microbes or decomposes, it cannot become a fossil.
- The process of decay is a long one as the hard parts of the body like bone and teeth take a long time to decay.
- Over a short period of time, we cannot get fossils because in short time period, only soft parts of the body decay which do not offer much explanation about the organism.
