List the parts of the respiratory system. in order as an oxygen molecule travels through them, beginning in the atmosphere and ending on a red blood cell.

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.

i think the answer is a.keratin is the pigment responsible for skin color.

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).