?(a) Which of the following cannot leave or enter a closed system: heat, work, or matter? (b) Which cannot leave or enter an isolated system?

Step 1 of 5) Which of the following cannot leave or enter a closed system: heat, work, or matterWhich cannot leave or enter an isolated systemWhat do we call the part of the universe that is not part of the systemMRI has had such a profound influence on the modern practice of medicine that Paul Lauterbur, a chemist, and Peter Mansfield, a physicist, were awarded the 2003 Nobel Prize in Physiology or Medicine for their discoveries concerning MRI. The major drawback of this technique is expense: The current cost of a new standard MRI instrument for clinical applications is typically $1.5 million. In the 2000s, a new technique was developed, called prepolarized MRI, that requires much less expensive equipment and will lead to an even greater application of this important diagnostic tool.