If a terrestrial ecosystem has a net primary production of 3,000 kcal/m2/yr and a cellular respiration rate of 2,000 kcal/m2/yr, what is the gross primary production for this ecosystem? 100 kcal/m2/yr 500 kcal/m2/yr 1,000 kcal/m2/yr 5,000 kcal/m2/yr

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?  

The phase where ice changes directly to gas is called sublimation 

We can't until we know what we are working with or on

The ratio is 3: 2. i.e. c.