Abody of water in which eutrophication has occurred is

devoid of oxygen and essential nutrients

Explanation:

Eutrophication is a process that results from the excessive growth of surface water plants in any water body due to nutrient enrichment. This nutrient enrichment is caused by the flow of chemicals such as fertilizer, pesticides and insecticides from any nearby farms that flows and comes along with the surface runoff (resulting due to rainfall)

Algal boom happens due to increased nutrient enrichment in any water body. These plants consume all the dissolved water oxygen and leave very rare or no oxygen for water animals due to which these organism die after certain period of time

in situ hybridization has been widely used for research applications, including clinical cytogenetics, gene mapping, tumor biology and studies of chromosome evolution.