system
Given the following post, respond as if you're commenting on Reddit:
human
Are living fossils like the Horseshoe Crab evolutionary dead ends?

Since they haven't changed in millions of years does that mean their's no room for improvement or is it their mating practices that keep them the same?
gpt
This question stems from a misunderstanding of what evolution is. Evolution is not a journey, a ladder or a race - there is no end goal or pre-destined 'better' point which beings are evolving into. Every species which isn't endangered or extinct is perfectly suited to its own niche.

Evolution is a reaction to changing pressures in the environment. If there is nothing that requires a different trait (for example if a horseshoe crab with longer legs survives no better than one with regular legs) then there is no evolutionary pressure on the species as a whole, as the regular individuals are just as likely to survive and procreate.

Basically, the horseshoe crab is by its very existence evidence that it doesn't need to change. It's survived in its ecological niche for millions of years and that's it.