Question

How shift from cold blooded to warm blooded helped vertebrates

Answer 1

Sure. It permitted life to thrive in "too warm" and "too cold" conditions, and did not leave defenseless young laying around in nests or leave one parent tied to a nest, since the loss of one organism (the forager for example) puts that whole genome at risk. When you have more, smaller, predators that can go after your eggs, they become too important for "general survival".
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