What happens when a species stops evolving because nothing pushes it to evolve further?
A species can NEVER stop evolving. There are two main reasons for this:Coevolution. No species evolves alone. The environment a species is in does not just mean the salinity of the ocean, the climate, or atmospheric composition, it also includes other organisms. That means other species, predators, prey, parasites, vegetation for food, shelter, camouflage, etc. It also includes members of the same species, mates and rivals. They are all evolving in their own way in a complex web of coevolution. Even if the niche and physical/chemical environment stay roughly constant, arms races with other species and sexual selection within a species will force change.Genetic drift. Mutations happen. You can’t stop it. It’s how life works. Even if there were no evolutionary forces at work (something that is impossible) mutations would still accumulate over time and change the species subtly and gradually.When people say animals like sharks and horseshoe crabs haven’t changed for many millions of years, the are talking about niche and overall shape. I guarantee you that if you transported a modern shark back 100 million years ago, it would be very different to sharks of that age, in terms of immune system, reproductive system, digestive system, more sophisticated senses, etc. External forces, like the physical reality of swimming through water at speed provides an evolutionary pressure to keep the species from deviating too much in overall physical shape and behaviour, but there are still lots of changes going on, especially under the hood, so to speak.
What is your theory of everything?
I particularly believe in Causality.Even though I can't explain it with extreme precision, I believe it has its advantages.So what is Causality?Causality, which is sometimes also known as “Cause & Effect Theory” is the relationship between causes and effects.Simply put, Everything happens because of a Cause & then it has its own Effect.This effect can also be a cause for another event thus creating a chain of events.There are diagrams, known as Causal Diagrams which represent an example of Causality such as the picture belowHere in this example it can be seen that:Traffic accident is the cause & it's effect is Traffic Jam. And Traffic Jam is cause of Being late for school.There are numerous such examples which can explain this theory & I believe this Theory works for everything in this universe.Causality is debated on topics such as “What about events which don't have a cause?”Well I believe that there are some events for which we don't know the cause but that doesn't mean it doesn't have any.Causality is sometimes also referred to Karma but I think that it has nothing to do with it. Karma has a totally different explanation of things or events.( Karma is the belief that a person's actions cause certain effects in the current life and/or in future life, positively or negatively.)Someday, we may have a solid understanding of this topic but for now, I think my explanation has become something like this image below ;)