Define the term "cremation."

The term "cremation" is defined as the process of reducing a body to ashes through high-heat combustion. This process typically involves placing the deceased in a cremation chamber, where extreme temperatures are applied to decompose the body into its basic elements. The result of this process is the production of ashes, which are often referred to as "cremains." Cremation serves as an alternative to traditional burial and can be chosen for a variety of personal, cultural, or religious reasons.

The other choices do not align with the definition of cremation. Preparing a body for burial refers to embalming and the related activities leading up to a traditional burial. The method of burial involving biodegradable materials describes natural or green burial practices but does not pertain to cremation. Lastly, memorializing the deceased in a service focuses on honoring and celebrating the life of the deceased, which is a distinct process separate from the physical act of cremation itself.