Photic or euphotic zone is how much deep from the upper surface of sea
$10$ metres
$100 $ metres
$200 $ metres
$500$ metres
It’s obvious.
Robert Constanza and his colleagues have put an average price tag……. for ecosystem services
Succession proceeds from
The agent/s which make/s free atmospheric nitrogen available to plants is/are
Assertion: Insectivorous habitat of plants is to cope up $O_2$ deficiency. Reason: Insectivorous plants are partly autotrophic and partly heterotrophic.
Energy for the detritus food chain comes from
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