Which of the following statements is true? Energy can be created, but not destroyed. Some machines are 100 percent efficient. Atomic energy can't be converted into electricity. When work is done, some energy is always "lost" as heat.

Part a - which gene to compare? in this exercise, you will use the cytochrome c oxidase i (coi) gene to investigate relationships among salmon species. (this gene encodes a protein that functions in the mitochondrial electron transport chain.) you will compare the coi gene sequences from your salmon test samples to the standard sequences for each salmon species. in order for the coi gene to be useful for distinguishing among the different salmon species, which three statements must be true?