I NEED SOMEONE TO ANSWER MY QUESTIONS (2) IN TOTAL BOTH OF THEM EQUAL 60 POINTS

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

Plz will mark! the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes