Correct Answer: Option C

Explanation

Green algae are known to form symbiotic relationships with a variety of organisms, including fungi, marine invertebrates, and some animals.Some hydra species, such as Hydra viridissima, have a symbiotic relationship with green algae. This symbiosis is characterized by the algae living within the hydra's endodermal cells, giving the hydra its characteristic green colour. 

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