A group ==Key Stage 3=====Meaning===An [[organ]] is a part of an organism, made of several tissues, that does a specific job. ===About Organs===: [[Organ]]s are made of more than one different specialised [[tissuestissue]] in a creature which s that work together to perform a function.: Only [[multicellular]] [[organism]]s can have [[organ]]s because [[tissue]]s are many of many [[Cell (Biology)|cells]].: An [[organ]] may have more than one job. ===Plant Organs=== ===Organs in Mammals===