That process take places over long Period of time … or you are joking?

There are some examples of evolution happening much faster than you'd think. The traditional view was that it took tens of thousands of years for a species to change, but there have been some with notable changes in only a few generations.

All that needs to happen is 1) there exists some (breeding) individual who contains the mutations, and 2) the selection pressure is strong enough.

I would think at least a hundred generation ? Maybe 50? How many generation those Russian foxes started to have floppy ears?

It’s not a genetically homogeneous population, so maybe there are some already much better at finding flowers in pollution, and those ones will be more likely to survive and pass on that trait?

I’m being quite serious (though not that knowledgeable on evolution science). It’s not like they have to develop gills. Perhaps a minor change is sufficient?