However, chance events, such as asteroid impact can radically alter the environment and thus change which individuals are best adapted to pass on their genes, and thus the fittest.

• 但是，一些偶然事件，比如小行星撞击地球可以彻底改变生存环境，从而会改变哪些个体最适应环境来传递基因，进而使其成为“最适应”的个体。