Answer:
air
Explanation:
Oxygen and glucose are both reactants in the process of cellular respiration. The main product of cellular respiration is ATP; waste products include carbon dioxide and water.
Answer:
The saprotrophs and detritivores are placed to one side of the pyramid because they are decomposers which feed on dead bodies of all the living organisms which are present in the trophic levels i. e. producers, primary consumers, secondary consumers and tertiary consumers etc. When they feed on dead bodies, they released nutrients which are used by the plants.
Scientists believe that over 99% of species that once existed on Earth are now extinct.
D. over 99 percent