Mixture. a compound is 2 or more elements, so it can't be an element
The bone patterns in mammalian limbs can be further traced to the bone structure of the Xenarthra species as far as its histology is concerned. There has been a bone compactness showing pattern most specifically in the femur area between the species of Cingulata and Pilosa.
OK the the answer you are looking for will be the excretory system because that is the system that releases waste.
Three examples would be gamma rays (usually these rays are emitted from unstable isotopes and can be used in nuclear experiments and testing) ultraviolent rays that are emitted from the sun and can cause sunburn and even skin cancer because the rays mutate the DNA in the skin cells nucleus. And also X-Rays, microwaves, and radio waves, which is usually harmless because it isn’t enough radiation to mutate DNA in our cells
I hope this is what you wanted
