What is it called when oxygen passes into the capillaries that surround these sacs?

How are proteins and nucleic acids related? they both provide energy. they both carry genetic information. the structure of proteins is determined by nucleic acids. the subunits of nucleic acids are also the subunits of proteins.

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

Need with these questions . need the answers in a rush for these questions are the answers i put down are correct or not? ?