The endosymbiotic theory opposes that mitochondria in eukaryotic cells rose from C. Endosymbiotic prokaryotes that metabolized oxygen.
 
        
             
        
        
        
Answer:
Oxygen is moved around the body of an echinoderm in its C. water vascular system.
 
        
             
        
        
        
The heating of the troposphere<span> is </span>caused<span> by convection currents. Convection currents are created when the sun warms the air currents at the planet's equator to a greater degree than it does at the planet's poles.
Hope this helps you, and happy studying~!
~Mistermistyeyed.</span>
        
                    
             
        
        
        
The answer is that it means that the oxygen would be difficult to carry throughout the body, which happens that ATP would be lacking.  Because to create energy there’s a need for respiration and it requires an oxygen.  Also, other body systems will slow down because anaerobic respiration doesn't create enough ATP for the entire body.
 
        
             
        
        
        
Answer:
7. 4
8. 2
9. 3
Explanation:
Just a guess, please double check :)
Hope this helped