Answer:
The oxygen cycle is closely linked to the carbon cycle and the water cycle (see hydrological cycle). ... Carbon dioxide enters the carbon cycle or is taken up by plants for photosynthesis. During photosynthesis oxygen is evolved by the chemical splitting of water and returned to the atmosphere
Explanation:
 
        
                    
             
        
        
        
Answer:
A truly du/\/\b question
that said I would say E only
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Answer: They both circulates from a region of lower concentration to a region of higher concentration. 
 
        
             
        
        
        
Answer:
D. Swamp 
Explanation:
The photograph shows an ecosystem that is saturated by water. The plant species shown in the photograph are mostly trees and wooden species. These are characteristics of a swamp ecosystem. A swamp ecosystem is a wetland characterized by trees and wooden species. Therefore, the photograph shows a swamp ecosystem.