Which of these is least likely to be a major feature of secondary succession?
A) the return of animals
B) lichen activity
C) hardwood tree growth
D) grass growth

the last one: artificial selection/genetic engineering

plant breeding is modifying the genetic composition of the plant - but this isn't cloning (which is specifically introducing a gene into a genome). but you are artificially selecting for the phenotype that you want.

the second one is literally genetic engineering - the gene would have been cloned first and then inserted or genetically engineered into the new plant cell (the cotton).

i don't understand

explanation:

i don't understand your question