SIGNS OF WEATHERING MECHANICAL OR CHEMICAL ABOUT LOCATION flakes of brick- ? ? cracks in rocks- lichen growing in rocks- root or plant growth making cracks in concrete- worn away statues- exposed rock- rust on rocks- example you found:

this is math not biology xd

c is the correct answer!

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).