Final answer:
Out of the options given, the Uterus is the type of specimen that would not be placed in a preservative solution.
Step-by-step explanation:
In a laboratory setting, specimens are often preserved in a solution to prevent decay and maintain their structure. However, certain types of specimens do not require preservation and can be used without being placed in a preservative solution.
Out of the options given, the specimen that would not be placed in a preservative solution is the Uterus. The uterus is an organ and would typically be examined fresh or fixed in a formalin solution, rather than being preserved in a preservative solution.