Which letters are broken down to produce energy for cells? There’s two

C and D

Explanation:

Cellular respiration, which is the process whereby energy in form of ATP is synthesized, occurs in the MITOCHONDRIA. The products of cellular respiration (CO2 and H2O) are used as reactants by plants to produce glucose and oxygen in their CHLOROPLASTS in a process called PHOTOSYNTHESIS. The glucose and oxygen are broken down in the MITOCHONDRIA to yield energy by cells.

In this image, letters C and D represents glucose and oxygen, which are products of photosynthesis in the chloroplast. Glucose and oxygen represented by C and D are broken down to produce energy for cells in the mitochondria

what in the weirdo : o

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).