Red-bellied black snakes (Pseudechis porphyriacus) in Australia are highly susceptible to the cardiotoxins produced by invasive cane toads (Rhinella marina). Since the introduction of cane toads in 1935, some populations of red-bellied black snakes have evolved physiological resistance to these toxins.
With reference to Darwin's theory of evolution by natural selection, explain how these populations of red-bellied black snakes have evolved resistance to cane toad cardiotoxins.
