Evolution, if not all organisms, is found in almost all kinds of organisms. Indeed, there are many articles and research on the evolution of marine life. Watching evolution is based on the ability to gain food and shelter, and the final results usually go to the evolution of animals or organisms to get better than any of these in general. For example, the head of a short seahorse has evolved to better capture their bait, the copepod (Ornes, 2013). Depending on the shape of the head, you can detect the water in front of the nose (Ornes, 2013).
This concept in biology is called convergent evolution. Two completely different species growing in similar circumstances may seem like twins. Typical examples are from Australia and North America. Mammals in North America are genetically unrelated to Australian marsupials, but please check how similar they are to each other. In both cases, the flying squirrels are completely independent. Australia is a completely different island from North America, but similar environments bring similar selection pressures and similar features. So, there are mariners such as moles, wolves, appetizers
According to Darwin, the origin of the species has evolved into two different subspecies. Darwin has a different interpretation of the meaning of "origin of species". The way I understand is that the two groups of the same species are separated from each other in different environments. After several generations of development, these two groups developed different characteristics. Over time, more variants and new species have evolved. Assuming Darwin is correct, can humans evolve into two different species? For example, in the future, let's say a group colonizes Mars. For many generations, Martian humans will be different from humans on the planet. The difference between Earth humans and Martian humans is initially small, but in the future there may be two types of humans, the Earth's human beings and the Mars human beings.