It is based on shared characteristics
5 atoms 2 iron and 3 oxygen I hope this helps
The greenhouse effect is the trapping of a stars warmth in the lower atmosphere of a planet by gasses in the air trapping the energy. This is similar to what actual greenhouses do, where they trap the warmth and humidity of the air inside it so plants can flourish. Farm animals produce a huge amount of the greenhouse gasses required for our planet to trap the suns warmth.
Uh the answer is eating food.
The answer to your question is H2O
