Symbioses
 

Explanations for answers to quiz on mutual benefits for sponges growing intertwined:

They resist environmental stresses better. Yes. Each species has different known susceptibilities to predation, smothering by sediments, damage from storms, disease, and so on. By mutualistically growing intertwined, they better survive risks to which alone they might succumb.

They share nutrients. No. At this time here is no known cross-transfer of nutrients between different species of sponges.

They are actually just colour morphs of the same species; hence, not mutuals. No. They are different species and, thus, could be considered as behaving mutualistically. Note that this stretches the normally accepted view that mutualism involves one organism living in or on another.

 
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