Question

because of the costs involved in maintaining high temperatures and pressure, nuclear______is not yet a practical method for generating electrical energy. which best completes the statement? fusion fission energy generators

Explanation:

Nuclear fusion requires extremely high temperatures and pressures to combine light atomic nuclei. Currently, the technology to sustain and control this process economically for power generation is not fully developed. Nuclear fission (splitting heavy nuclei) is already used in power plants. "Energy" is too general. "Generators" are not the process described.

Answer:

fusion