The Apollo Civilization, a Fourth-level Civilization with a considerably long history, originated from a hot and humid marine planet.
Marine planets are universally recognized in the Milky Way as the most difficult starting point for technological development.
Although the infamous Level 5 Civilization, the Green Star Civilization, had emerged from such marine planets, there was only one Green Star Civilization with an extraordinary Racial Value throughout the long history of the Milky Way. Among ten thousand marine planets, nine thousand nine hundred ninety-nine are inhabited by native Biological species or low-level creatures similar to fish.
These Biological communities have a tiny chance of giving birth to intelligence, just as dolphins on Earth possess a certain level of Intelligence. Give them more time, and they might become even smarter.