Use what you know about fossils to choose the correct answers from the drop-down menus to complete each statement
If the same organism appears on two different continents, this is evidence of
Fossils show how organisms change, or
over time.
Fossils provide a record of animals that are vor no longer living.

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.

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.