Sorry for the other guy. He was rude. Here's the answer:
Animals excrete CO2 by cellular respiration. Since any living things besides plants can't break down CO2, it just gets put back into the environment. I hope I helped you :)
 
        
             
        
        
        
- Make sure taps and such have no leaks. 
- Keep a bucket underneath taps and use the water saved in them for gardening. 
- Avoid flushing the toilet when unnecessary ("If it's yellow let it mellow, if it's brown flush it down"). And avoid throwing tissues in the toilets, instead throw in a proper bin. 
- Never put water down the drain when there may be another use for it such as cleaning or watering a plant or garden. 
- Water lawns during the early morning hours when temperatures and wind speed are the lowest. This reduces loss from evaporation. 
<span>- In the school yard, use mulch to retain moisture in the soil. Mulching also helps to control weeds that compete with plants for water. 
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Bubbles formed in the magma when it was still in liquid form :)
 
        
             
        
        
        
The people lived in Mesopotamia are known as Mesopotamians.
The physical environment and the natural
resources found in Mesopotamia changed the life of Mesopotamians.
<span>They viewed the world because the environment
is very suitable for agriculture, which freed up time for other activities like
art, religion etc. and thus it makes them the modern society.</span>
        
             
        
        
        
Answer:
Radical is an atom or a group of atoms of different elements that act as a single unit during chemical reaction.
Explanation:
For example: Hydrogen, Nitrogen,Nitride,Nitrate,Ammonium, etc.