The Viking Landers performed experiments on Mars to look for evidence of Martian microorganisms.The one that was NOT performed was the

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The Viking Landers did not perform a water-transpiration experiment. The other three experiments listed (gas-exchange, labeled-release, and pyrolytic-release) were all carried out by the Viking Landers to search for signs of life on Mars.

The Viking Landers Performed Experiments on Mars to Look for Evidence