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     This test does not allow backtracking. Changes to the answer after sub. Remaining Time: 56 minutes, 55 seconds. Question Completion Status: Moving to the next question prevents changes to this answer. Discuss two ways in which diatoms are important to human society? For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). 
  
  Solution
Diatoms are the major primary producer in the globe. They produce oxygen more than the all the world tropical forests put together
Whatever the oxygen taken inside by us are atleast 1/4 of its from diatoms
Recently freshwater diatoms are also used as bioindicators, to detect the pollution.
They can be used as filters (for wine), abrasives (for toothpaste), and oil (from diaatom beds)
They are the primary producers that trap the Sun\'s energy and thus the basis of all life in the oceans
Hope it helps
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