Answer:
a. A mammal species that can live equally well on dry land and in fresh water
Explanation:
Species need favorable conditions to thrive, reproduce, and survive going extinct from an environment. When such conditions change in an environment, and the species in that environment are unable to evolve along with such changes to become adapted to survive, they go extinct.
From the options given in the question, the least likely to become extinct is a mammal species that can live equally well on dry land and also in fresh water, as they would be well adapted to changes that occur in their habitat .