Multiple choice The algae capable of reducing mercury levels in humans is ____________. Aphanizomenon flos-aquae Chondrus crispus Chlorella Ulva lactuca Palmaria palmata Reveal answer Fill a bubble to check yourself C Correct answer Explanation Chlorella is very popular in Japan. It is also used as a nutritional supplement with possible effects on metabolic rate. It can reduce mercury levels in humans by chelation of the mercury to the cell wall of the organism.