Avery acidic ph level is and a very basic ph level is 1; 13 13; 1

1, 13

Explanation:

pH can be define as the measurement of the hydrogen ion concentration in the solution. It is the measure of the acidity or alkalinity of a solution. The pH scale usually ranges from 0 to 14. Aqueous solutions at 25°C with a pH at 7 considered as neutral, less than 7 are acidic, and a pH greater than 7 are basic or alkaline.

A very acidic pH is 1, and the very basic pH is 13.

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).