Answer:
Option (A)
Explanation:
Fossils are defined as the dead residues of ancient flora and fauna that are buried millions of years ago. They are found to be embedded in the sedimentary rocks. They are useful in determining the relative age of a rock or fossil.
The type of fossil that forms depends on how the organisms have died and the conditions under which the dead organism was buried. The fossils are found as mold and cast, trace fossils and the fossil's true form. If the fossils marks its imprints on the soft sediments then the molds are formed and cast forms when the mineralised sediments gives the shape of the exact fossil by filling up the mold. Trace fossils are formed when the organisms leaves an imprint while they move from one place to another. This is how the fossils and their types are determined.
Thus, the conditions under which these fossils are died and buried is necessary to understand and also these fossils are very important in the field of Paleontology as it helps in understanding the past environment, climate and the organism's food habitat.
Hence, the correct answer is option (A).
