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I think the question is too open to give a definitive answer, but several directiosn can be pointed out right away.
Laws of biology are not rigorous
Due to the inherent complexity of biological systems, the laws of biology are less susceptible to mathematical analysis than those in physics or chemistry. Firstly, this is because many of these laws are ...
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Thermoregulation and echolocation both depend on evolutions that occurred on land and seem to be less accessible to fish than to the ancestors of mammals. The heat capacity of water is much greater than air, so maintaining an elevated temperature in body tissues is both more difficult and less necessary. Still, some fish lineages have independently evolved ...
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The similarity IS high
The main thrust of the question is the high similarity (98–99%) between human and chimpanzee genomes. The concern is that the use of the human genome as a scaffold for assembling part of the chimp sequences in the whole chimp genome project, published in 2005, is a possible source of error in this figure so that the similarity is ...
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Advantages of air breathing over gills? Keeping in mind water-breathing animals could still evolve lungs.
Not being vulnerable to parasites and diseases of the gills, which are obliged to have blood supply close to the water.
Able to colonise water regardless of salinity, able to survive warm water.
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I don't know the answer properly, so I welcome other input.
You can probably work this out more or less empirically. Going through the (possibly incomplete??) lists of island gigantics and insular dwarfs you can see a list of which islands they have been found on. Also ignoring the dinosaurs, as we don't properly know the size of islands in those cases
The ...
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