The gas that living things need to survive is composed to two oxygen atoms covalently bonded to each other (O2). A- humans artificial bond molecules together so we don’t run out of useable oxygen. B- Oxygen does not have a full nucleus of protons, and therefore binds with other molecules to fill each of their nuclei. C- Oxygen is a very sticky element and therefore gets stuck to also other atom floats past. D- Oxygen does not have a full valence electron shell, and therefore binds with other molecules to fill each of their shells. HELPP PLS !