Sinlge-celled organisms and soft, boneless animals. Back then organisms were single-celled and simple.
They use a formula and that formula is
People/Land Area=Population Density
The nucleus is important to a living cell because <span> it serves the function of information storage, retrieval and duplication of genetic information. It is a double membrane‐bound organelle that harbours the genetic material in the form of chromatin.</span>
With respect, G0 meaning what?