The correct answer is B. Natural selection occurs through generations and is in which organisms best suited to their environment survive.
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<h2>Answer:</h2>
The lake with high level of intolerant fish has a high quality of water.
<h3>Explanation:</h3>
Intolerant fishes can be described as the fishes which need a special environmental conditions for their survival like high quality of nutrients, high oxygen content in water and temperature etc.
While tolerant fishes can live in a wide range of environments like low quality of water.
So when in a lake there is high amount of intolerant fishes it means it contains high amount of quality water.
