Comment Re:IANACS, so could someone explain? (Score 1) 130
Not long ago I saw a documentary about the evolution of coral. It discussed how there are only a handful of species and the rest are a hybrid mix of those. They explained how these "true" corals were very resilient and could survive when others died off; then when conditions permitted the other hybrids would return. They also discussed how ocean levels aided in the propagation of the corals, and allowed them to spread.