What is the problem with the bonding of two nitrogen atoms ?

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms

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

How can you tell the difference between rough er from smooth er?