Many scientists disagree about the safety of genetically modified foods, with some countries banning them out right. What evidence is needed to show that a particular GMO is unsafe?

Trees with light brown bark dominate an ecosystem the ecosystem has populations of insects that thrive on the tree bark over time some insect species developed certain physical characteristics that them thrive on the tree bark these physical characteristics also the insects defend themselves from predators which insect species is probaly the species with the new physical characteristics?