Answer:

1)GMOs are organisms that have had their characteristics changed through the modification of their DNA. ... Genetically modified (GM) organisms are organisms that have had their genomes? changed in a way that does not happen naturally. By changing an organism's genome we can change its characteristics.

2)GMOs have helped farmers reduce their environmental footprint by allowing them to use fewer inputs and enabling a shift to reduced tillage. These practices have led to less time spent on a tractor, less fuel used and fewer emissions.

3)Five sets of ethical concerns have been raised about GM crops: potential harm to human health; potential damage to the environment; negative impact on traditional farming practice; excessive corporate dominance; and the 'unnaturalness' of the technology.