<span>the one that is nor released by trees into the atmosphere is : Ozone
Ozone is the layer beneath the atmosphere that protected us from the harm of direct sunlight.
Ozone is already exist within the earth and not created by organisms. We only produce the substance that potentially destroy it</span>
        
             
        
        
        
B, because it is the correct answer because i took that test lol 
        
                    
             
        
        
        
Answer:
Alveoli
Explain:
 They are the workhorses of your respiratory system. You have about 480 million alveoli, located at the end of bronchial tubes. When you breathe in, the alveoli expand to take in oxygen. When you breathe out, the alveoli shrink to expel carbon dioxide.
 
        
             
        
        
        
Answer
Characteristics of young rivers are;
•	The river is small and flows with less energy down steep slopes
•	Features formed are a result of erosion
•	These rivers form V-shaped valley 
•	Form interlocking spurs when they meet obstacles
Explanation
A river in its youthful stages has a steep river gradient. The river is in most cases narrow and deep. Waterfalls and rapids are common in youthful stages of a river. The river channel is considered narrow and deep, with a V-shaped valley present. Vertical erosion is dominant and the channel of the river generally winds.
 
        
                    
             
        
        
        
Answer:
 The answer is Endothermic!