C. consumers depends upon producers for food
        
             
        
        
        
Answer:
.40+900=900.40+300=1200.40 
Explanation:
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Gross primary productivity (GPP) is the rate at which - E: producers convert radiant energy into chemical energy
Gross primary productivity, or GPP, is the rate at which light energy or radiant energy is used to form and store chemical energy in sugar molecules during photosynthesis.
- Producers use stored chemical energy for metabolism and cellular respiration for growth and development.
- amount of living organic material is supported by a particular ecosystem.
- the energy produced per unit area over a given time span
Thus, Gross primary productivity (GPP) is the rate at which - E: producers convert radiant energy into chemical energy
Learn more about photosynthesis:
brainly.com/question/1757345
 
        
             
        
        
        
Explanation:
    Isotopes: 
                           ₁₅³¹P   and     ₁₅³²P
      Given parameters: 
         ₁₅³¹P                                                   ₁₅³²P            
    Mass number = 31                                    32
    Atomic number = 15                                 15
The two atoms are isotopes. Now let us derive numbers of their subatomic particles 
                        ₁₅³¹P                                             ₁₅³²P   
Protons              15                                                 15
Electrons           15                                                  15
Neutrons         (31-15) = 16                               (32-15) = 17
Because they are isotopes, they differ in the number of neutrons alone. 
Isotopy is the existence of two or more atoms of the same element having the same atomic number but different mass numbers due to the differences  in the number of their neutrons. 
We clearly see that the mass number and number of neutrons pertaining to the atom differs. This makes them isotopes. 
Learn more: 
Isotope brainly.com/question/1915462
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Answer:
Diffusion
Explanation:
Substances like CO2 and water move into and out of a cell by diffusion from an area of high concentration to an area of low concentration.