1.

BODis a measureof

Answer»

OZONEDEPLETION in THESTRATOSPHERE due totoo manyfree radicals.
Suspendedparticulatematter in the air causingproblems
Pesticideswhich arenonbiodegradablein the soil andwater.
ORGANIC materialpresentin waterneedingdissolved OXYGENTO BREAK them downdepleting oxygen contentin water.

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