D CHLOROPHYAT NOT THE OTHER ONES
Peyer's patches are lymphatic tissue patches that are located in the small intestine. The lymphatic system provides an immune response for the body, so if there was an infection of the Peyer's patches, the body's defense system in the small intestines, which would make the intestines more susceptible to cancer or infection.
I believe it would be a fossil of a reptile but I'm not a 100% sure about it.