Which of the following conditions characteristics atomospere 111

The condition is which characteristics of atmosphere III is nitrogen-rich and oxygen-poor. Nitrogen-rich is one of the condition in which the atmosphere III characterizes. The other is oxygen-poor, is one of the condition characterizes atmosphere III. Nitrogen-rich material mostly called green because they are greenish in color. Oxygen-poor means the blood enters the RA or Right atrium or the upper chamber of the heart.

This is what i did 45-5=4040÷4=10so there are 10 white marbles but am not sure is just a question that am not sure