Explanation:
In most ecosystems, the pyramid of numbers and biomass are always upright except for the pyramid of biomass for aquatic ecosystem and the pyramid of number for tree ecosystem.
In an ecosystem dominated by trees, the pyramid (of numbers) is of Inverted type because it makes more biomass that leads to the large population of birds and insects as compared to the trees.
In a deepwater ecosystem, the producers are small organisms (phytoplankton) with the least biomass and the biomass gradually increase towards the apex of the pyramid (from small fishes to large fishes). Thus the pyramid of biomass of aquatic ecosystems is inverted in shape.
The pyramid of energy is always upright because the energy flow in a food chain is always unidirectional that means energy flow at successive trophic levels always decreases.
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$R$ - Methanogens are used for fermentingmalted cereals and fruit juices to produceethanol.