Ionic compounds are formed from strong electrostatic interactions between ions, which result in higher melting points and electrical conductivity compared to covalent compounds. Covalent compounds have bonds where electrons are shared between atoms.
The respiratory system contains the lungs, so the answer is C. Hope this helps.
<em>limestone</em>
<em>The most common chemical sedimentary rock, by far, is limestone . Others include chert , banded iron formation , and evaporite</em><em>s</em><em>.</em>
