The model shows a portion of a dna strand. what doe the pentagon represent in the model?

Aflame cell is at the end of each tubule of the nephridium malpighian tubules kidneys none of the above

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

Mineral rich water heated by newly found oceanic crust escapes through cracks in the ocean floor called