Are butterflies endothermic or ectothermic?

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.

it marks things for degradation via the proteasome. it alters there celluar location.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added