In this case, they were measuring the differing responses to lethal doses of salt between groups of tadpoles. Those that came from the salted parking lot pond s

In this case, they were measuring the differing responses to lethal doses of salt between groups of tadpoles. Those that came from the salted parking lot pond survived longer. What leads you to believe this adaptation isn't genetic? Do you have an alternative, non-genetic explanation as to why these certain tadpoles are better able to tolerate otherwise lethal doses of salt?