6. Parts per million is used to express the A) atomic mass of an element B) concentration of a solution C) volume of a substance D) rate of heat transfer A B​

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

it would be rhyolitic hope this

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.