Why is photosynthesis important to the biosphere? *
A. It produces oxygen for animals to breathe
B. It produces sugars for animals to eat
C. It gets rid of carbon dioxide
D. All of these
dont answer unless its the real answer please

Two kilograms of air within a piston–cylinder assembly executes a carnot power cycle with maximum and minimum temperatures of 800 k and 300 k, respectively. the heat transfer to the air during the isothermal expansion is 60 kj. at the end of the isothermal expansion the volume is 0.4 m3. assume the ideal gas model for the air. determine the thermal efficiency, the volume at the beginning of the isothermal expansion, in m3, and the work during the adiabatic expansion, in kj.