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Scientists say they have [greatness / greatly] advanced the possibility of being able to reproduce the body's organs [viva / via] the use of 3D printing. Replacement organs could be created [using / usage] a new technique for bio-printing organic [tissue / issue] . This allows scientists to create networks of thin tubes and vessels, like [them / those] used in our body for the flow of blood and air. These are [called / naming] vascular networks. Bio-engineering professor Jordan Miller explained [why / which] the breakthrough was so important. He said: "One of the biggest roadblocks to [generation / generating] functional tissue replacements has been our [unable / inability] to print the complex [vascular networks] that can supply [nutritional / nutrients] to densely populated tissues."

Professor Kelly Stevens of the University of Washington wrote about the [difficult / difficulties] scientists had in recreating a vascular network. She said: "Tissue engineering has [struggled / struggle] with this for a generation." She [believes / beliefs] the new breakthrough will allow medical [practices / practical] to change in the future. She asked: "If we can print tissues [what / that] look and now even breathe more like the healthy tissues in our bodies, will they also then [function / functionally] behave more like those tissues?" Professor Stevens said "This is an [important / importance] question, because how well a bio-printed tissue functions will [effect / affect] how successful it will be as a [therapy / therapist] ." Scientists hope this method will help millions of people waiting for an [organ / organism] transplant.