Place the items in order from highest to lowest degree of internal organization.
tissue
organ system
organ
cell

organ system> organ> tissue> cell

Explanation: Molecules combine to form cells, cells combine to form tissues, tissues combine to form organs, organs combine to form organ systems, organ systems combine to form organisms.

the correct answer is b

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.