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.
Thus, life on earth probably arose between 4.0 and 3.5 Ga. Between 3.5 and 2.0 Ga, the most common fossils are stromatolitesâmicrobial mats that grow into small mounds and hummocks by trapping fine mud on sticky surfaces.