Final answer:
The development of resistance against the cane toad's toxins by some native Australian snake species is an example of an adaptation. This evolutionary process occurs as predators with resistance traits are more likely to survive and pass on their genes, leading to an increased prevalence of these traits in future generations. The correct option is b.
Step-by-step explanation:
After the introduction of cane toads in Australia (1935), some native species of snakes (predators) have developed resistance against the toxic skin of the cane toads (prey).
This can be seen as an adaptation of predators. The term adaptation here refers to the genetic changes that increase the physiological resistance of the predators to the toxins of the invasive species, cane toads.
This resistance reflects an evolutionary response allowing these predator species to survive and coexist in an altered environment.
It's important to note that the development of these adaptations occurs over generations, through selective pressures on the predator populations.
Those individuals that are, by chance, more resistant to the toxins are more likely to survive and reproduce, leading to the resistance traits becoming more common in subsequent generations. Option b. is the correct one.