Answer:
Explanation:
This might help-?;
Electron Transport System and Oxidative Phosphorylation: ATP is generated when electrons are transferred from the energy-rich molecules like NADH and FADH 2, produced in glycolysis, citric acid cycle and fatty acid oxidation to molecular O 2 by a series of electron carriers. O 2 is reduced to H 2 O
 
        
             
        
        
        
Rivers, because rivers have currents that streamlined bodies are built for
        
                    
             
        
        
        
Natural selection acts directly on those gene variations for traits or phenotypes.
The phenotype of an organism is the physical characteristic and is determined by the organism's genotype. Natural selection selects the genes that produce a certain phenotype by providing suitable conditions for a certain phenotype.
        
             
        
        
        
Answer:
A=Vacuole
B=chloroplasts
C= cell membrane
D= endoplasmic reticulum
E= nuclear envelope / or nucleus in general
F= The cell wall.