The second law of thermodynamics suggests that when energy is converted from one form to another, some is dispersed as into the environment.

The correct answer is heat.

According to the second law of the thermodynamics, 100% of the energy is not converted into the form of work done. Some amount of energy is lost in the form of heat.

The energy is radiated in the form of the heat in the ecosystem. When any work is done , then the energy is transformed from one form to another and in changing its form some amount is lost in the form of heat.