Answer:
Skin acts a defensive and protective layer. It protects the internal body from pathogens, which are disease causing bacteria. The skin can fend off bacteria, particles, foreign bodies, etc.
Explanation:
I think 1 is C and 2 is A
well when they were around that was decades and centuries ago so the bones have probably deteriorated from being pushed so far down in the earth
On edge the answer is similar size, mass, and density.