What do you mean by the term ,'symbiosis' ?
Sayonara (~‾▿‾)~

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sayonara this is Japanese word

sayonara means bye

interaction between two different organisms living in close physical association, typically to the advantage of both.

#Carry on learning o(〃＾▽＾〃)o

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.