What is the primary indicator observed as the body undergoes changes after death?

The primary indicator observed as the body undergoes changes after death encompasses both decomposition and insect activity. After death, a body undergoes biological deterioration, known as decomposition, which includes various physical and chemical changes. This process is influenced by environmental conditions such as temperature and humidity, leading to the breakdown of tissues and the release of gases. Insect activity is a significant aspect of this process, as various insects, particularly flies, are attracted to decomposing bodies. They lay eggs on the remains, and the larvae feed on the decaying tissue, which can provide valuable information regarding the time of death and the surrounding conditions.

The interaction between decomposition and insect activity is critical in forensic science, as both phenomena can help forensic scientists establish a timeline for death and the circumstances surrounding it. Therefore, acknowledging the importance of both decomposition and insect activity allows for a more comprehensive understanding of post-mortem changes. This intertwining relationship is a core concept within the study of cadaver analysis in biomedical science.