How are fish more complex than other organisms?

Fish know how to breathe, eat,  sleep underwater they evolved swimming and only knowing how to swim. Some fish can temporally fly while others can see and live deep into the ocean. There are fish that know how to hunt while some know how to hide in plain sight. While in bodies of water there are fish that can be good for the environment and some that are bad. Some have scales some don't some have spikes and some have multicolored scales.

Explanation:

it's c. (to reduce the greenhouse effect/carbon gasses)