Final answer:
Latent fingerprints' longevity is influenced by surface type, environmental conditions like temperature and humidity, and the residue composition left by the finger.
Step-by-step explanation:
The longevity of latent fingerprints is influenced by various factors. The surface on which the fingerprint is deposited plays a crucial role; porous materials like paper may retain prints for a longer time compared to non-porous surfaces like metal. Environmental conditions such as temperature, humidity, and exposure to elements also greatly influence the durability of fingerprints. High humidity may cause sweat on the ridges to swell, making the prints more discernible, while heat can cause the residue to evaporate more quickly. Additionally, the amount and composition of the residue left by a finger - which can include sweat, oils, and other contaminants - can affect how long a print lasts.