What is the best description of the geology of Mars?

Mars has mountains, valleys, and volcanoes, but the red planet's are by far the biggest and most dramatic.Recent and continuing missions to Mars are showing that the Red Planet may be more geologically active than previously thought.Olympus Mons, the solar system's largest volcano, towers some 16 miles above the Martian surface, making it three times taller than Everest.Geologists think one of the reasons volcanoes on Mars were able to grow so large is that Mars has fewer tectonic boundaries in comparison to Earth.

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Adenosine deaminase or ADA gene is an enzyme which contribute in purine metabolism. It breaks the adenosine present in food and convert nucleic acids in tissues. It function in the maintenance and development of the immune system.

Stop codon signal the end of protein formation during translation and they do not code for an amino acid.

Stop codon will terminate the protein synthesis in ADA gene as it do not code for any amino acid and will cause nonsense mutation which will affect the immune system of the body.