Fossils --
(i) provide a concrete 'documentary' proof of life in the respective periods.
(ii) They provide us a convincing clue of the evolutionary process- how life progressed from simple to complex life forms.
(iii) They also throw light on the climatic conditions of that particular period. We can guess what conditions prevailed in those periods and how the life responded / accommodated to those conditions.
(iv) They act as indicators of sources of fossil fuels- like coal and petroleum.
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Fossils provide valuable information about the history of life on Earth, including how organisms evolved and diversified over time. They also offer insights into past environments, climate conditions, and interactions between species. By studying fossils, biologists can better understand the origins and relationships of different species, as well as make predictions about future evolutionary trends.
Because they show how other organisms evolved or became extinct.
According to Biologists, the large domain that includes the oldest known fossil cells is called bacteria within the prokaryotic microorganism.
Fossils can make materials like fossilized limestone or marble attractive to architects due to their unique patterns and historical significance. The presence of fossils in the material provides a natural and visually interesting texture that can add character to buildings and bring a sense of timelessness to design.
Biologists study living things like plants and animals.
If you're lucky, and the geology is right, you sure can. You're looking for sedimentary rock, like limestone, although interesting fossils can also be found in sands and gravels exposed by running water. Most people are not lucky enough to have fossils literally in their backyards, but fossils are common enough that one would suspect that most people are living within reasonable driving distance of a good locality. Even volcanic islands like Hawaii can have fossils. Fossils can even be found in large cities; look for excavation sites, armor stone along rivers, or the stone used in buildings.