What microscopic organisms live symbiotically within the clam's mantle tissues?

Answer

Zooxanthellae

The symbiotic relationship enabling their large size involves microscopic algae called zooxanthellae living within the clam's mantle.

What microscopic organisms live symbiotically within the clam's mantle tissues?

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GIANT CLAM: Weighs up to 500 pounds | Oceana - YouTube

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