After surgical removal of the spleen (i. e., a splenectomy), some other organs take over most of its functions. which of the following spleen functions in the adult can not be performed by bone marrow? a. immune surveillance b. erythropoiesis c. removal of aged and damaged red blood cells from the blood d. storage of platelets

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's

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).