Deep ponds, in which oxygen is absent except, perhaps, across a relatively thin surface layer, are called : (a) Aerobic ponds (b) Anaerobic ponds (c) Facultative ponds (d) Polishing ponds

Question

Deep ponds, in which oxygen is absent except, perhaps, across a relatively thin surface layer, are called : (a) Aerobic ponds (b) Anaerobic ponds (c) Facultative ponds (d) Polishing ponds

Deep ponds, in which oxygen is absent except, perhaps, across a relatively thin surface layer, are called :
(a) Aerobic ponds (b) Anaerobic ponds
(c) Facultative ponds (d) Polishing ponds

asked Sep 4, 2021 by anonymous

1 Answer

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