I dont remember much of biology but i do remember my teacher saying something about phosphate backbone, i know its not much help. sorry!!
<span>If a noun ends in a vowel, simply add -s.If a noun ends in a consonant, simply add -es.If a noun ends in a -z, change the z to c before adding -es.If a noun ends in ión, drop the written accent before adding -es.<span>If the plural refers to a mixed group, use the masculine.</span></span>
The answer would be respiratory because that system is used to breath oxygen and exhale carbon
"glazed"
Glazing is the process of covering a ceramic piece with glass allowing it to hold liquid (and food) without leaking. when left a small part of the ceramic not glazed allows the pottery piece to be fired in a kiln without exploding.
