The ability of an antigen to react specifically with the antibodies or cells it has provoked is called

i think its white blood cells

i hope this

geologic time scale (for gradpoint) =)

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).

what are the options