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Phytoplankton are the autotrophs that are the main producers for the upper layers of the ocean.

This is because the upper layers of the ocean provide the most sunlight, which is what phytoplankton need in order to perform photosynthesis.

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13y ago
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14y ago

Phytoplankton.

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13y ago

algae.

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14y ago

phytoplankton

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12y ago

Algae

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Q: What is the main producer of the upper layers of the ocean?
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