Exotic species are the species which are not native to the region to which they are introduced. They can be referred as alien, non indegenous species. These species are introduced either due to human intervention in order to use these species for their own benefit or these species migrate from their native land in search of food and other resources. These species may act as an invasive species, which means they compete with the native population for resources. Therefore, they will disturb the natural biodiversity of the ecosystem.
Hence, exotic species when introduced in an ecosystem they can outcompete native species.
Yes, this is true because some bacteria in our environment tends to either fend off of or kill other types of bacteria. In this case, this bacteria is helpful because it turns gaseous nitrogen into a form that can be absorbed and used by plants in our environment.
