An experiment was conducted using two different species of Paramecium: P. caudatum and P. aurelia. When the two species were grown in separate flasks, both species thrived. When the two species were grown in the same flask, P. aurelia thrived, and P. caudatum declined. What best describes the relationship between these two species

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).

cuz some people don't have enough food. that's why we need more ppl to donate food to the hungry.