Answer:
us humans need a balanced ecosystem because its what keeps us alive. when having a balanced ecosystem we have cleaned water, purified air, maintained soil, regulates our climate, recycles nutrients, and provides us with food. 
 
        
                    
             
        
        
        
It was how fast it was disappearing. Once the world's fourth largest lake, the Aral Sea in Central Asia has been losing water for half a century — ever since Soviet engineers began diverting the two rivers that sustain it, the Amu Darya and Syr Darya, in order to grow cotton in the desert.
 
        
             
        
        
        
Answer:
Mitochondria
Explanation:
Mitochondria produces energy rich ATP molecules.
 
        
                    
             
        
        
        
It is called cell division
        
             
        
        
        
Brainstem.
The brainstem is the portion of the central nervous system that's located between the spinal cord and the d<span>iencephalon and it occupies the posterior cranial fossa in front of the cerebellum. It is divided into three parts: the rachidian bulb, the pons, and the midbrain.
It's in the brainstem that can be found the commanding nucleus of the most basic homeostatic mechanisms such as heart rate, breathing, and n</span><span>ociception.</span>