Fossilisation is
A. Organisms destroyed by scavengers
B. Organisms eaten by predators
C. Animals buried and preserved by natural process
D. Organisms destroyed by calamities

Hint: Fossils are the left out traces of organisms on the rock or other geological structures. These impressions are not created within a few span of years instead they are to be buried in the ground on any rock or limestone on which an organism has to reside after its death.

Complete Answer:
- Scavengers are the organisms found in the ecosystem which are responsible to bring out cleansing of dead and decaying organisms as they feed on it, there might not be any traces left out after scavengers action.
- Predation and prey are one of the major concepts in the food chain ecosystem where a dominant organism tends to capture a recessive organism and feed on it, most of the predators are carnivores, the organisms on which predators feed is called prey.
- Organisms destroyed by any natural disasters such as tsunami, earthquake, volcanic eruptions and more will be definitively buried but their traces will be hard to find and they do not turn into fossils.
- Fossilisation is a natural process where animals, Plants and other organisms are buried under the ground and they remain unaltered which will tend to leave a certain impression of their skeleton or exoskeleton on the rocks after thousands of years.

So, the correct answer is Option C.

Note: Fossils are not only the impression of animals of huge size or skeleton, there are also the impression of plants, bryophytes, and other organisms, there have been discoveries of fossils of single celled organisms. Fossils become the path to archeologist, palaeontology to understand evolution and other ecological concepts.