Blood Types. Distinct molecules called agglutinogens (a type of antigen) are attached to the surface of red blood cells. There are two different types of agglutinogens, type A and type B.
Fossil fuels are hydrocarbons, primarily coal, fuel oil or natural gas, formed from the remains of dead plants and animals. In common dialogue, the term fossil fuel also includes hydrocarbon-containing natural resources that are not derived from animal or plant sources.
Fossil fuels are made of the fossilized remains of living things that died millions of years ago. Coal, oil, and gas are the most important fossil fuels. Today, they provide most of the worldâs energy.Plant remains decay to make brown, crumbly peat when they are buried and squashed.oal, oil, and gas are the most important fossil fuels. Today, they provide most of the worldâs energy. Plant remains decay to make brown, crumbly peat when they are buried and squashed.