Soap, pots, and pans Pots and pans, phosphate, nitrification, nutrients, anoxic https://cuentos.ivanfgonzalez.com/wp-content/uploads/2014/05/potsandpans6.mp3
Good bear/ Bad bear Good bear/ bad bear https://cuentos.ivanfgonzalez.com/wp-content/uploads/2014/05/goodbearbad.mp3 Buen oso/ mal oso
