Water may become polluted and also become scarce to the agriculture due to the population increase
Answer: No, because evolution can also produce new traits on a species without changing it. Lizards in an area where the surface is slicker, may develop stickier feet in order to stay rooted to their surfaces easier. Some mice become immune to poison, and some bacteria and germs that are often vaccinated for become immune to those vaccinations and can get past those barriers.
Explanation:
An enzyme is a kind of catalyst. Hope this helps:-)
I think that it would be a toss up between sight and touch. For example, for sight they dont really rely on that one a ton due to the fact that many fish use there hearing and smell to find things, and touch because they are in water after all all the times and when they get food they dont go around feeling things for other fish/food.