Correct Answer - Option 3 : fossil
Fosils are the remains of dead plants and animals buried in the layers of rocks.
Fossils and the process of their formation:
- Fossils are the preserved remains, or traces of remains, of ancient organisms.
- Fossils are not the remains of the organism itself! They are rocks.
- A fossil can preserve an entire organism or just part of one. Bones, shells, feathers, and leaves can all become fossils.
- Fossils can be very large or very small. Microfossils are only visible with a microscope.
- Bacteria and pollen are microfossils.
- Macrofossils can be several meters long and weigh several tons.
- Macrofossils can be petrified trees or dinosaur bones.
- Preserved remains become fossils if they reach an age of about 10,000 years
Hence, the fossils are the preserved remains, or traces of remains, of ancient animals and plants