Which of the following are the essential sources for releasing in the atmosphere?
$I.$ Burning of wood
$II.$ Volcanic activity
$III.$ Combustion of organic matter
$IV.$ Fossil fuels
Choose the correct option
$I, II \;and\; III$
$II, III \;and \;IV$
$I, III\; and\; IV$
$I, II, III\; and\; IV$
Energy flow and energy transformations in living systems strictly conform to the
The aquatic organism that can actively swim at will against the water current is
In the following, there is no difference.
The trophic level of S-bacteria and cyanobacteria is