The producers in aquatic ecosystems include organisms in which of the following groups?
a. cyanobacteria
b. algae
c. plants
d. photoautotrophs
e. all of the above are correct.

E

Explanation:

The primary producers of the aquatic food web are phytoplankon.

Phytoplankton are "photoautotrophs," harvesting light to convert inorganic carbon to organic carbon, and they supply this organic carbon to diverse "heterotrophs," organisms that obtain their energy solely from the respiration of organic matter.

Most phytoplankon are microscopic marine algae and Cyanobacteria . They are oxygenic photosynthetic bacteria. They harvest the sun's energy, absorb carbon dioxide, and emit oxygen. Like plants and algae, cyanobacteria contain chlorophyll and convert carbon dioxide to sugar through carbon fixation

Most phytoplankton are buoyant and float in the upper part of the ocean, where sunlight penetrates the water.

e. All of the above are correct.

Explanation:

Cyanobacteria are primary producers in several aquatic ecosystems. Most lake organisms depend on algae as a primary food source. Other aquatic plants also serve as producers but not so much. Green plants and photosynthetic bacteria are all examples of photoautotrophs, which are primary producers in water.

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