During the natural ageing of lake, which of the following is/are expected to happen?

(A) Lake fertility increases

(B) Plant-animal life burgeons

(C) Lake grows shallower and warmer

(D) Organic remains begin to deposit at the bottom of the lake. 

Eutrophication is the natural aging of a lake by  nutrient enrichment of its water.  As the lake’s fertility increases, plant and animal life burgeons, and organic remains begin to be deposited on the lake bottom. Over the centuries, as silt and organic debris pile up, the lake grows shallower and warmer.