Scientists are debating how to limit their newly-discovered powerto change genetic structure.Scientists already modify the genes of farm animalsand agricultural plants to make them more productive or stronger.But now they can also change genes in wild animals and plants.These genes would continue into later generations.For example, it may be possible for scientiststo remove from existence the kind of mosquitoes that carry the Zika virus.They might also be able to permanently remove species of plants and animalsthat are destructive to other species.In a report published last week,the U.S. National Academies of Sciences, Engineering and Medicine (NAS)said it supports continued research on this kind of gene control.But it warned that it is not possible to knowwhat will happen when these changed plants and animals are released into the wild.Sixteen biologists, ethicists and policymakersare on an NAS committee that is examining the issue.They say that there is value to the new technology.But, they say, there is not enough evidence to supportthe release of modified organisms from the laboratory into nature.Many people would support stopping mosquitoes and rats from carrying diseases.But scientists say we must understand the possible scientific,ethical, legal and social results of such action before we decide whether to take it.Gene modification is spread through reproduction.Changed genes will continue to spread as long as an animal or plant continues to reproduce.They cannot be limited to a farm or kept within a country's borders.Scientists are wondering what would happenif a modified organism mates with another species.They are not yet sure how the modified genes would affect the other species.It is possible that those genes could harm those creaturesor even lead to their disappearance from our planet.