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Evolution: Extraterrestrial Life


Scientists discover a unicellular organism growing on the surface of a meteorite recently recovered from a site in Russia. The meteorite struck the planet just seven days prior to being discovered, and the scientists wonder whether or not the organism is extraterrestrial.

Which of the following observations about the organism provides the BEST evidence that the organism evolved on Earth?


The organism is able to lower the activation energy of many spontaneous reactions so that they progress at temperatures low enough to support life.


The organism is able to synthesize polymer molecules by joining monomer molecules in sequence.


The organism requires a constant input of energy from its environment to survive.


The organism uses ATP molecules to drive many of its anabolic reactions.