Lungs 3D Model - Hollow Inside

My daughter needed a model for class, but we didn't want to print all of the inside to lower the print time and material used. Modified the file in Meshmixer. I'm new so sorry if it could have been a bit cleaner.

There are two versions, one set with openings in the bottom and one that is completely closed but all of the insides again have been manually removed.

*She will be siting the original owner Beatrice1975.

Thanks again for the model.