What is the role of a pioneer species in primary succession? A. to destroy parasites
B. to provide shade
C. to provide fruit
D. to produce the soil

         D. to produce the soil

Explanation:

edge 2021

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).