If the bluegrass population stores 20,000 kcal of energy, how many kcal are available for the robin population? A. 20 kcal
B. 200 kcal
C. 2,000 kcal
D. 20.000 kcal
E. 200.000 kcal

It is true because i have took the test and it came out to be true

Okay well gravitational energy is matter forced by gravity making energy though the kinetic energy then the electric energy produces electricity from the kinetic energy and the kinetic energy gets its energy from the gravitational energy. was that the answer you wanted or something else?  

Answer/when the cell uses energy;