Which of the following best describes ecofacts?

Ecofacts are defined as non-artifactual evidence that holds cultural significance, typically derived from natural environmental elements rather than human-made objects. This can include items such as seeds, bones, pollen, and other organic remains that provide insights into the diet, environment, and other aspects of a culture's way of life. These elements are crucial for understanding how past cultures interacted with their environment and utilized natural resources.

The other options do not accurately capture the essence of ecofacts. Objects that have been significantly altered by technology would pertain more to artifacts, which are typically defined as items that have been intentionally made or modified by humans. Portable tools made by ancient civilizations would also classify as artifacts rather than ecofacts, as they represent human ingenuity and technology. Artifacts from burial sites similarly pertain to human-made items that reveal aspects of cultural practices surrounding death and burial, not the natural evidence that ecofacts embody.