A group of salamanders lives deep in the forest, where the ground is nice and moist, and there is a lot of shade from the sun. In this scenario, which of the following is a biotic component?

a. the sun
b. soil
c. moisture (water) in the soil
d. salamander

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?