If we do terraform Mars we will have done it by causing comets to fall onto the surface in a controlled way. The only way to keep the gasses and most of the water from ablating away (regardless of the agent) will be to continue the controlled replenishment with comets. They do. Infact wind is a strong source of species dispersal in mosquitoes. Air currents during their activity periods carry them to distant places where they form a fresh inoculum. Mosquito population resistant to insecticides move to new places via this way. Insecticide resistance genes of mosquitoes are also carried by winds at places where no chemical treatment has been exercised ever before.
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