because its made up of many separate but interactive parts or spheres. They are studying how these spheres are interconnected.
we breath from trees
actually bubbles can be almost any shape, it depends on how it is built up, or how it was blown. or your question may be how come bubbles cant be spheres in which case it can be.
It means lost in love
Hydrosphere.
Spheres representing nitrogen and oxyfgen are different colors so you can easily tell them apart.I can't see or don't know what spheres you are asking about but I am guessing that they are different colours so that you can easily see which is nitrogen and which is oxygen
nitrgen
No, nitrogen is an element.
q or 6
nitrgen dioxide
Greek.
-210 0C
nitrogen is an element.It is represented by N (only in capital letters).
Nitrgen, oxygen.
exhaling used oxygen,nitrgen,carbon
changes in the DNA sequence
Spheres