Some agree its in the billions range somewhere close to 3 billion.
        
             
        
        
        
Answer:
Aerobic cell respiration is roughly 18 times more efficient than anaerobic cell respiration. Your cells require a lot of energy and are dependent on the high efficiency of aerobic respiration. Overall, aerobic respiration converts about 40% of the available energy of glucose into ATP.
 
        
                    
             
        
        
        
Answer:
Tropism can be called positive or negative. Positive tropism is movement or growth towards a stimulus, whereas negative tropism is the movement or growth away from a stimulus.
Explanation:
 
        
             
        
        
        
Answer:
The correct options are: A "
vestigial wings, red eyes" and D "full wings, purple eyes"
Explanation:
female parent: vg+pr+/vg pr 
(phenotype - full winged and red eyes)
male parent:  vgpr/vgpr 
(phenotype - vestigial winged and purple eyes)
Of these traits, vestigial wings and purple eyes are recessive traits. Hence, when a recombination event occurs, the offspring can potentially have a wild type trait paired with a recessive trait.
 
        
             
        
        
        
Brachiopoda hope this helps :)