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 involves the combining of light nuclei (not heavy nuclei). Hydrogen gas is a key fuel. High temperatures are required to overcome the electrostatic repulsion between nuclei. High pressure (not low pressure) helps in bringing nuclei close enough for fusion. Helium gas is a product of hydrogen - based fusion, not an ingredient.

Answer:

high temperatures, hydrogen gas