The movement of the ocean's crust
Answer:
2
Explanation:
Because if you add 1 to 8 you get 9 then subtract 9 by 7 then and your answer is 2
Answer:
Organ systems: human body and circulatory system
organs: heart
tissue: muscle
Explanation:
sodium-potassium pump. n. The enzyme-based mechanism that maintains correct cellular concentrations of sodium and potassium ions by removing excess ions from inside a cell and replacing them with ions from outside the cell.
Terrestrial ecosystems (tetrapods)
