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.
Fossils of ammonites-sea creatures that became extinct about 65 million years ago. Most of the evidence for evolution comes from the fossil record. Fossils show how much, or how little, organisms have changed over time.