Which of the following is a false statement concerning sea urchins? a. they eat seaweed.
b. they are echinoderms.
C. they have movable spines.
d. they have arms.

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain

What is the correct term for an area of rotating currents in an ocean? when ocean currents combine, they create an area of rotating currents called an

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