<Li> Runoff and infiltration from animal feedlots </Li> <Li> Runoff from mines, oil fields, unsewered industrial sites </Li> <Li> Overflows of combined storm and sanitary sewers </Li> <Li> Runoff from construction sites less than 20,000 m2 (220,000 ft2) </Li>

Which of the following best describes a lake that has been heavily polluted with excess nutrients