According to the first law of thermodynamics, organisms need to capture energy from the environment because
a. organisms are part of the natural food chain
b. nature provides food for life
c. energy can't be created

The answer is C. energy can't be created.

The first law of thermodynamics states that the total energy of some system is constant and it can be transformed, but cannot be destroyed or created. So, let's imagine that a biome is a great system in which energy is constant. Thus, organisms cannot create energy, they must use it form the environment.