The mouth has its own complex ecology that must be kept in balance for optimal oral health. (wellnessmama.com)
«Despite the new ideas about animal origins, we suspect that oxygen played a major if not dominant role in the timing of that rise and, in particular, in the subsequent emergence of complex ecologies for animal life on and within the sediment, predator - prey relationships, and large bodies» said Lyons. (sciencedaily.com)
The metabolic activity and genetic diversity peaked around sea floor layers packed with the remains of plankton called diatoms, which presumably provide the carbon and other nutrients for the more complex ecology. (sciencemag.org)