Convergent evolution may be the words you seek. This often happens when different species have to adapt to a similar environment. An example would be the similar body shape, and the shape of appendages; of both fish and of marine mammals.
Your question can be interpreted in two ways:
1. Two different species that independent of each other develop similar traits (example: bats have wings and birds have wings).
Then it would be called "Convergent evolution"
2. Two different species co-exist and evolution within one species triggers a responding evolution in another species (example: prey evolves faster running, predator has to evolve to be able to capture prey (faster running, smarter hunting, pack hunting, camoeflage, etc))
This is called "coevolution"
Co-evolution occurs when two species evolve together.
divergent evolution or adaptive radiation - produces homologous structures in the species divergent evolution or adaptive radiation - produces homologous structures in the species
Co-evolution is when two species evolve in tandem.
Some people call this evolution but there is no scientific evidence that evolution happens
Symbiosis
coevolution
Niche. If they occupy the same niche, then they are competing for the same resources. Eventually one species will evolve to be better suited for competition and the other species will become extinct. So it is then said that one species needs to evolve into a slightly different niche in order to end interspecific competition.
No, the unaffected species would not evolve. Why?Becauseit is neither helped nor harmed, so it is /unaffected/. It's like it doesn't even realize it's happening.
In nature a relationship between two organisms of different species is called symbiotic. These relationships can be both beneficial and harmful to one or the other. A relationship where one obtains a benefit without doing harm to the other is called commensalism. Where both species are benefitted it is called mutualism.
Different mice have different alleles
After many changes evolve in a group of animals, individuals of that group can no longer mate with the rest of the species that remain unchanged. That is the definition of species: individuals that are able to breed among themselves but are not able to breed with other species. When a group of individuals is separated from the rest of their species for a long time, the individuals can evolve different traits. The longer the group is isolated from the rest of the species, the more likely it will evolve into a new species. One example of this has been seen in fish species in the lakes of Switzerland, Great Britain, and Scandinavia. Almost every lake has different forms, believed to have evolved from one species.
Fossils' existence confirms that species are not fixed but can evolve into other species over time
Coevolution
Fossils' existence confirms that species are not fixed but can evolve into other species over time
You can't
COevolution
Niche. If they occupy the same niche, then they are competing for the same resources. Eventually one species will evolve to be better suited for competition and the other species will become extinct. So it is then said that one species needs to evolve into a slightly different niche in order to end interspecific competition.
They evolve and adapt so they have traits hat are useful to them, by Natural selection. This means that members of a species that are isolated, well, natural selection makes those with the best chances for survival mate with each other and produce offspring with that trait.
Certainly. Every living species can evolve. At some point seaweed evolved out of something, and other plants no doubt evolved out of seaweed-like ancestors. However, no individual plant or animal can evolve in the sense of changing into a different plant or animal in the course of a single lifetime.
When two groups of the same species are cut off from each other, they evolve from mutations and natural selection independently. Each one could evolve into a different species. For instance, let's say two populations of a species of bunny exist, one in a desert and one in the artic. The one in the desert would likely evolve into a bunny which could keep cool and blend into rocks and sand, while the population in the artic would likely evolve into a species which could keep warm and blend into snow. The one species of bunny would then become two.
coevolution
No, the unaffected species would not evolve. Why?Becauseit is neither helped nor harmed, so it is /unaffected/. It's like it doesn't even realize it's happening.
to study how different species are related to each other