Adaptation because organisms adapt to avoid extinction.
        
                    
             
        
        
        
3. is Phytoplankton  
4. Plankton produce their own food thru photosynthesis or lassoing energy
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Solar energy.
This is because the solar energy arrives and is trapped as radiation and heat. 
        
                    
             
        
        
        
By controlling what enters and leaves a cell, the cell membrane A) aids in maintaining homeostasis within the cell. Homeostasis is the process by which organisms maintain life through eating, growing, and living in variable conditions. It would not make sense to answer B) because organisms do not control the homeostasis of their external environment. D) also would not be correct because cell's do not control osmosis in the external environment. The membrane does not control osmosis because osmosis is generally a random process of molecular diffusion whereas the membrane acts in a conscious and controlled way.