The answer is letter A. In most organisms cellular respiration usually involves oxygen to produce the most energy. Except in the process of fermentation, where the cells are deprived with oxygen causing it to form bacteria and other forms of organisms within the fermented sample.
        
             
        
        
        
That would be the nuclear membrane. Eukaryotic cells have a nucleus that encases their DNA, so it stays safer than it would in a prokaryotic cell.
        
             
        
        
        
The answer is d because the ovary's job is twofold. They produce the hormones including estrogen.
        
                    
             
        
        
        
<span>B. Hypertension (high blood pressure). </span>
        
             
        
        
        
The answer: Ventricles.
There are four ventricles in the brain all connected between them, 
where the cerebrospinal fluid is produced. There is a choroid plexus in each ventricle that produce the fluid.
The  four ventricles:
<span><span>-  2 lateral ventricles right and left (one for each hemisphere)</span>
-third ventricle<span>
- fourth ventricle</span></span>