In the future, because of global warming, it will rain frequently over a large part of the Earth. The Earth will become a massive, shallow ocean. I believe that the Common Basilisk will adapt well to this future.
To adapt to the heat, the Basilisk will decrease their surface area by losing their fins. They will extend a flap of skin over their head to protect their eyes from the Sun. They will also turn black, which absorbs heat better.
In the future, more of the world will be covered in water. The Basilisk will adapt with fins that allow it to easily swim and run across the water. Currently, basilisks have many flaps of skin on their feet and run on tiny air bubbles in the water. They will also develop flippers and somewhat longer, more muscular legs so they can travel for longer times and over longer distances.
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