I'd say A: tidal waves. B, C, and D don't really seem to fit for me.
Answer: "mutations" .
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Plants stomata allow it to transpire and is also a mechanism used to 'suction' or 'pull' the water through the xylem
Distance/Time = 120 Km/2 hours =120/2 Km per hour or for short 60 Km per hour
