Structural organisation in animals attains different levels as cell – organ – organ system. What is missing in this chain? Mention the significance of such an organisation.
Structural organisation in animals attains different levels as cell – organ – organ system. What is missing in this chain? Mention the significance of such an organisation.

The correct arrangement is a cell – tissue — organ – organ system. A tissue is a collection of same types of cells which join together forms an organ and these organs join together form an organ system.