🤝⇄🤝
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#reciprocity
#mutualism
#mutual agreement
#give and take
#quid pro quo
#symbiotic relationship
🔬🐠🪨🦐
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#aquarium microbiology
#reef tank biology
#marine science
#water parameters
#symbiotic relationship
#invertebrate aquarium
#reciprocity #mutualism #mutual agreement #give and take #quid pro quo #symbiotic relationship