Secondary sewage treatment is distinguished form primary sewage treatment by the ________.
A) addition of bacteria to process organic contaminants
B) aeration of liquid effluent following chlorination
C) chlorination of the liquid effluent
D) removal of inorganic nutrients from the liquid effluent
E) separation of the suspended solids from the liquid effluent
Question 2
Bioremediation has been particularly effective in marine ecosystems in the clean-up of ________.
A) heavy metals
B) hydrocarbons
C) nitrates
D) pesticides
E) thermal effluents
Phenolic compounds as secondary metabolites
Secondary meristems generate wood and bark.
Male dolphins form alliances with others
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Satellite data showing net primary production. Productivity is coded as red (highest) down through o