It involves punnet inherited traits and punnet squares
an example of homozygous dominant would be AA
an example of heterozygous would be Aa
an example of homozygous reccesive would be aa
when an organism is homozygous dominant for a certain trait it means that they can only pass down the dominant trait to their offspring and their offspring will display the dominant trait
        
                    
             
        
        
        
Answer:
Respiration
Explanation:
cross off Photosynthesis because that is specifically for plants. Diffusion is when molecules move from high concentration to low concentrations. Osmosis helps transport water across the cell. 
By process of reduction you can figure it out, but here is what cellular respiration is in it's basics so you can remember in the future. Cellular Respiration is just the process that takes place in cells to convert Chemical Energy from nutrients and turn it into ATP, then releases waste.
 
        
             
        
        
        
 the presence of food in the stomach typically causes release of gastrin, but low pH inhibits release of gastrin.