each child to the right belongs to a different set of parents below. (1-3) Determine which child belongs to each set of parents.

i see no children

Explanation:

when it is at an intermediate population density

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).