What happens when hydrogen gas s passed over hot ferric oxide​

Which characteristics can be used to differentiate star systems? check all that apply.

Which are examples of how technology has advanced scientific understanding.1using hot water to sterilize medical equipment.2transplanting a human organ into another individual.3inserting genes from one sheep into another cell to make a cloneunderstanding the different structures that make up a cell.4examining microorganisms from the deepest parts of the ocean

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)