Which of the following best describes the effects of water pollution on aquatic ecosystems? a. it can result in fish kills and restrictions on human consumption. b. it can change the physiology of fish. c. it can cause long-term alterations of aquatic ecosystems. d. all of the above

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?