The answer is the Origin of replication. The origin of replication is a particular sequence in a genome at which replication is initiated. It may involve either the replication of DNA in living organisms such as prokaryotes and eukaryotes, or that of DNA or RNA in viruses, such as double stranded RNA viruses.
Fossil fuels represent carbon storage areas. Carbon that is locked in these fossil fuels does not cycle through the Earth. When humans burn fossil fuels, the stored carbon is released into the atmosphere as carbon dioxide. The carbon is then free to cycle through the Earth and can upset the natural balance of the carbon available, changing the way that processes occur on Earth.
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they have cell walls composed of cellulose and motile spores with two flagella
A cell wall is in a plant cell. A cell membrane is in an animal cell.