What is measured in radiocarbon dating of organic materials?
the ratio of carbon 12 to carbon 14 in a sample
the decrease in carbon 12 in a decaying organism
the increase of carbon 12 in a living organism
the ratio of carbon 15 to carbon 12 in a sample

the answer is c.

by: nicholas dooley

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).