What type of evidence can degrade if not carefully packaged?

The correct choice emphasizes that certain types of evidence, especially those that are sensitive to moisture, can degrade if not properly packaged. Evidence requiring moisture control is typically biological in nature—such as blood, saliva, or other fluids—since these materials can promote the growth of bacteria or mold, which can deteriorate the evidentiary value and integrity over time.

If such evidence is left exposed to moisture, it can lead to further degradation or contamination, making it less useful in an investigation. Proper packaging ensures an environment that limits exposure to conditions that could lead to these unwanted changes.

The other options do not capture this critical point. While all physical evidence can be affected by mishandling, not all will necessarily degrade in the same way or due to the same conditions. Evidence with no biological components does not require moisture control and therefore would not face the same degradation issues. Similarly, evidence obtained from solid surfaces might not present the same risks related to moisture as biological materials would. Thus, the focus on moisture control directly links the packaging of sensitive evidence to the preservation of its integrity, highlighting its importance in forensic investigations.