Question

choose the ingredients needed for nuclear fusion. check all that apply
heavy nuclei
helium gas
high temperatures
hydrogen gas
low pressure

Explanation:

Nuclear fusion is a process where light nuclei (not heavy nuclei) combine. Hydrogen gas is a common fuel. High temperatures are needed to overcome electrostatic repulsion between nuclei. Helium gas is a product, not an initial ingredient. High pressure (not low pressure) helps in bringing nuclei close.

Answer:

high temperatures, hydrogen gas