Why arteries have thick and elastic muscular walls?

What did the first language sound like

You are observing different types of cells in your science lab. one cell has many chloroplasts. what is the most likely function of this cell? a. energy production b. photosynthesis c. reproduction d. digestion

Cells must be in osmotic equilibrium with their surroundings environments because if they swell or shrink thier membranes will rupture