Final answer:
The long-standing practice of placing bodies in coffins on cliffs has been part of the Filipino Indigenous people's tradition in Sagada for thousands of years.
Step-by-step explanation:
The practice being referred to in the question is the tradition of placing the bodies of deceased people into coffins hung on the cliffs near their villages, which has been a long-standing practice among Indigenous people in Sagada, Philippines. This practice has been observed for thousands of years and is still continued today.