your option is also not realistic
so that the races themselves develop evolutionarily. The evolution of humans from apes took approximately 2 million years. Even taking into account the game time, I don’t want to wait that long, it’s nonsense.
But (insect progressors) exist that develop throughout life. there are for example: African pied grasshopper (initially non-poisonous) these grasshoppers feed on poisonous plants to protect themselves. They consume wild flowers called ragweed to become poisonous and no predators would want to eat them