Glands is one of the possible answers
Here is the order:
Gene,
DNA,
Chromosome,
Nucleus,
Cell,
Organism.
[Hey if this is wrong, don't post a rude reply! Message me and I will try to correct the answer!]
I think it is 3 i'm not sure but i'm about 70% sure
1. Sustainable 2. Environmental
The survival of the 2 percent of the population is due to the presence of a gene obtained from other species. This gene must be responsible for developing resistance in the insects, against the insecticide that was used by the farmer. The gene got incorporated in only 2% of the insects and therefore, they survived and rest of them were susceptible to the insecticide and thus, died.
