A field survey experience:

After observing examples of these major phytoplankton types, examine samples of water taken from local ponds or lakes. Can you deduce from the presence or absence of phytoplankton algae and cyanobacteria such as Microcystis what the relative mineral nutrient content of the water might be?

Answer: .hgih si tnetnoc cinagro ,tnadnuba si anelguE fi ;wol era slarenim ,rucco arunyS dna sdimsed fi ;etaredom era slarenim ,tneserp si xovloV fi ; hgih si tnetnoc larenim ,sitsycorciM ynam ees uoy fI .ytilitref retaw etacidni nac eagla ,yllacimehc deyassa tseb era slevel larenim retaw hguohtlA