Can grassland species live in other ecosystems or are they specific to particular sites? Why?

Well, as in most plant communities, there are some species that are ‘specialists’ and occur only in those communities, and others that are ‘generalists’ and have the ability to grow in a wide range of conditions – so they may occur through many communities through the state. The same is true of animals – it’s a different evolutionary pathway that organisms follow – either to spread themselves evenly across the landscape, or to congregate into a relatively small area where particular conditions prevail. The reasons plants may not be able to grow outside a particular area may be that the seeds require certain conditions, for example heating, chilling, burning, that aren’t available in all areas. Or the adult plants themselves may not be able to cope with being flooded from time to time, or being able to cope with fire, or summer drought. It’s a big question, with different answers for different species.