5. Nuclear fusion has not yet been harnessed as an energy source because .

lasers are too dangerous
of a lack of deuterium
the energy is hard to control
sufficient pressure cannot be generated

Iwould have to say the answer would be nitrogen

Hey there, for asking a question here.  the postovulatory phase  of the ovarian cycle leaves the leftover follicle, from which the ovum was released, develop into the corpus luteum.answer: letter a  ✅hope that ! ★ if you have further questions about this question or need more , feel free to comment below or post another question and send the link to me. -unicornfudge aka qamar