As food waste and other compostable items decompose in landfills, methane is released into the air. If this type of landfill waste increases, the amount of methane in the atmosphere will increase. What would happen to the total amount of energy in the Earth system and to global average temperature if methane in the atmosphere increases? If there is a change, explain how that change would happen.

rain is the best answer

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

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).