Kathy would have pain in her muscles due to <span>the accumulation of lactic acid in the muscles of her limbs, as a result of anaerobic respiration. </span><span />
Answer:
Higher levels of organization are built from lower levels. Therefore, molecules combine to form cells, cells combine to form tissues, tissues combine to form organs, organs combine to form organ systems, and organ systems combine to form organisms.
Explanation:
They are usually between the ages of teenage and adulthood
