discontinuous gas exchange
... that discontinuous gas exchange is a respiratory system used by over 50 species of insect?
... that <b id="mwBRY"><a href="./Discontinuous_gas_exchange" id="mwBRc" rel="mw:WikiLink" title="Discontinuous gas exchange">discontinuous gas exchange</a></b> is a <a href="./Respiratory_system" id="mwBRg" rel="mw:WikiLink" title="Respiratory system">respiratory system</a> used by over 50 <a href="./Species" id="mwBRk" rel="mw:WikiLink" title="Species">species</a> of <a href="./Insect" id="mwBRo" rel="mw:WikiLink" title="Insect">insect</a>?