This would be known as anaphylaxis. I know this very well as I am allergic to so many things. This can result into being life threatning as well. Depending on what the reaction is to, there is things to control the systems til you get help ie., epipens for like bee stings.
B. Bacteria would be your answer
Red-tailed hawks are well documented ophidiophages, or snake eaters
Hope that helps
Answer: Decomposition in pools, ponds, and lakes takes place mostly in the benthic zone.
Explanation: