These were formed hundreds of millions of years ago from remains of living organisms and before the time of the dinosaur.

a. fossil fuels
b. minerals

Fossil Fuels

Explanation:

Fossil fuels are formed hundreds of millions of years ago from remains of living organisms and also before the time of the dinosaur.Mostly these fossil fuels are formed when an organism dies and their bodies are burried.Many different processes i.e physical and chemical occurs which create fossils.The bodies of organisms are buried with sediment. As time passes,the sediment turns into sedimentary rock.Carbonization or distillation are the processes that tells a detailed carbon impression of dead organisms in sedimentary rock.Permineralization is the common method of fossilization.