For a basic 500 square feet project in zip code 47474, the benchmark cost to Insulate Your Home ranges between $0.63 - $1.43 per square foot* . To estimate costs for your project: 1.
So in answer to your question, the oldest fossils are stromatolites, and the life forms that created those fossils were prokaryotic bacteria and algae like cyanobacteria.
Most fossils form when living things die and are buried by sediments. The sediments slowly harden into rock and preserve the shapes of the organisms. Which parts of an organism are most likely to be preserved as fossils? Why? hard parts of an organism generally leave fossils - these hard parts include bones, shells, teeth, seeds, and woody stems. It is rare for soft parts of an organism to become a fossil because when an organism dies, its soft parts often decay quickly or are eaten by animals.