A mammoth carving, designed out of a horse's shoulder blade, was found in waters covering the ancient Bering Strait and land bridge. A 0.500-gram piece of this bone was observed to undergo 1,187 carbon-14

decays in a 1-hour period. A 0.500-gram piece of bone from a modern source underwent 7,251 carbon-14

decays in the same period. Approximately how old is this bone carving?

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?