"The word 'eutrophy' is formed of two parts. [i]Eu[/i] is an astronomical abbreviation for the Earth, meaning 'well' or 'good'. [i]Trophy[/i] refers to feeding. Eutrophism occurs when there are abundant nutrients in the water,"
Price: "10"
"Many of the trees on Mitcham Common (just outside London) are encrusted with this common yellow lichen. Lichens represent a symbiotic relationship between a fungus and an alga, and their presence indicates non-polluted air. Here, the lichen has taken hold"
Price: "10"
