Mouth, esophagus, stomach, small intestine, large intestine.
Diffraction could have caused it. This is where a wave encounters an obstacle or a slit. It happens when there is bending of light around the corners of an obstacle. It is often described as the interference of waves according to the Huygens–Fresnel principle.
Answer:
Humans are a big reason for this issue. Things such as pollution, hunting, construction, and animal testing all effect the wolves population. Their food is hunted by humans so its harder for them to hunt, humans tear down trees and take over ground so theres less places to live, they might eat things like plastic because people litter, and things like dangerous weather can harm these animals.