
Diffusion refers to the random motion of particles from a medium of higher concentration to a medium of lower concentration.
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Answer:
Elastic Fibre
Explanation:
Due to its ability to stretch and return to it's Normal size. It is one of the three main types
I believe it's producers, correct me if I'm wrong.
If there is no oxygen , the cells go through anaerobic respiration which leads tot he build of lactic acid in the muscles. This is why we get sore and feel the burn during a workout.