Respuesta :
Answer:
Option D, Phytoplanktons
Explanation:
In an energy pyramid, producer i.e an organism which is able to make food lies at the bottom.
Phytoplanktons are able to entrap the carbon dioxide from the ocean and sunlight to produce food through the process of photosynthesis. This food is consumed by all aquatic organisms directly or indirectly.
Thus, pytoplanktons can be considered as the producer of the aquatic ecosystem.
Being the producer, phytoplanktons lie at the bottom of the energy pyramid found in the ocean.
