Which of the following is a cause of tissue separation on the water bath during microtomy and nuclear bubbling after staining?

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Insufficient fixation time allows tissue to be only partially penetrated and not fully stabilized by the fixative. When tissue isn’t fixed long enough, proteins aren’t adequately cross‑linked, leaving the specimen softer and more fragile. That lack of rigidity makes sections prone to tearing or separating when you float them on the water bath during microtomy, so you see tissue separation. It also disrupts how the tissue interacts with stains, so nuclei can appear bubbled or vacuolated after staining because the nuclear and cytoplasmic components aren’t properly preserved and stabilized. Extending the fixation time ensures the fixative penetrates thoroughly and cross-links proteins more completely, producing firmer sections that stay intact on the water bath and yield more reliable nuclear staining.

Depleted fixative or other choices relate to fixation quality or technique, but the specific pairing of separation on the water bath and nuclear bubbling most directly points to inadequate fixation time allowing poor stabilization and penetration.