For 10 points, name this process in which two entities change in a dependent manner on each other.
In astronomy, some researchers contend that galaxies and black holes have become subject to a version of this process, while on a molecular level it is invoked to explain similarities in the genomes of endosymbiontic mitochondria and eukaryotes, such as in the genes for their respective cytochrome c oxidases. More common examples involve flowers and bees adapting to each other to make pollination more favorable, and predator and prey continually evolving new ways to outwit each other; that is the so-called Red Queen hypothesis for this, in which sex is an advantage due to its resulting genetic diversity. For 10 points, name this process in which two entities change in a dependent manner on each other.
In astronomy, some researchers contend that galaxies and black holes have become subject to a version of this process, while on a molecular level it is invoked to explain similarities in the genomes of endosymbiontic mitochondria and eukaryotes, such as in the genes for their respective cytochrome c oxidases.
{co-evolution}