Which element is classified as a noble gas? sulfur, oxygen, argon or nitrogen

Which element is found in both dna and proteins

What are the most explosive events that occur on the sun? umbras solar flares solar winds prominences

Photosynthesis uses co2 and cellular respiration produces co2. we call the point when the two processes are in balance--when there is no net production of co2--the compensation point. how might you limit one of the processes in order to achieve a compensation point?