Cells are basically grey goo. It is also not uncommon for cancer cells to become independent of the host. See HeLa cells for a human example. These are cancer c

Cells are basically grey goo. It is also not uncommon for cancer cells to become independent of the host. See HeLa cells for a human example. These are cancer cells taken from a woman who died in 1951, but which are still living and dividing today (in some way forming a new species): https://en.wikipedia.org/wiki/HeLa https://en.wikipedia.org/wiki/HeLa