Evolution
When does the last round happen, and does the first extinction end the game?
The rulebook sets the last-round rule, and the thread confirms a first extinction does not end the game.
If the trait deck runs out during the Deal Cards phase, that round is the last and scoring starts at its end. If the deck runs out at any other time, such as a replacement draw after an extinction, one more full round is played. A first extinction alone does not end the game.