You're gonna have to give us a picture to support your question..
The best way may be is going over the notes on the chapter you were doing. Or going over the chapter once or twice.
Answer:
The blood vessel from lungs to heart is pulmonary vein which carries oxygenated blood.
Answer:
big pp BIG PP small pp :(
Although amino acids may have other formulas, those in protein invariably have the general formula RCH(NH2)COOH, where C is carbon, H is hydrogen, N is nitrogen, O is oxygen, and R is a group, varying in composition and structure, called a side chain.