The correct answer is option A
Water is the most important component of all living beings. The dependence of organisms on oxygen is much because it an important component of water which is required for the survival. The various types of life processes and metabolic reactions depends on the water to take place. The body is dependent on water for it.
 
        
             
        
        
        
There are many reasons to why slaves were essential in the colonial economy: 
Slaves were generally used more in the south, because large plantations were found there, which meant that the need for large amounts of workers.
Slaves provided cheap labors, and as they were not "citizens" of the US, they were not allowed their rights. 
Slaves were also relatively easy to buy and replace, however, their survival rates were not that good after they traveled long distance. 
etc.
hope this helps
 
        
             
        
        
        
A, I’m pretty sure, Meiosis helps with genetic diversity
        
                    
             
        
        
        
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.