Sustainable yield determines the maximum rate at which a renewable resource can be harvested.
Selective breeding makes use of existing, naturally present gene variants in a species? and the natural process of breeding. Genetic engineering involves a direct change to an organism's genome in the laboratory. Gene variants made through genetic engineering can be passed from one generation to the next.
After reading the description attached to the graph represented on the picture, I would say that the resistance gene was present in the aphid population as a result of changes in the aphids’ local habitat by the insecticide. I consider the second option as a correct one because according to the amount of spreading of insecticide<span> per year there was a possibility that it caused a such a change.
Do hope it will help you!</span>
Internal changes, like body muscle decreases; the size, shape and function that occurs in our body to function in a mature system.(phenotype) >hope that help
