1. Structure and Function:

* Tissues are groups of similar cells that work together to perform a specific function. For example, muscle tissue contracts, nervous tissue transmits signals, and epithelial tissue covers surfaces.

* Organs are made up of *multiple* different tissue types that work together to perform a *more complex* function. For example, the stomach contains muscle tissue for churning, epithelial tissue for lining, connective tissue for support, and nervous tissue for control.

2. Hierarchical Organization:

* Tissues are the first level of organization above individual cells.

* Organs represent the *next level of organization* in the body, built from multiple tissues.

3. Specialization and Coordination:

* Tissues are relatively simple, performing specific tasks within a larger organ.

* Organs are highly specialized and integrate the functions of their constituent tissues to perform a complex, coordinated function. For example, the heart pumps blood using muscle tissue, controlled by nervous tissue, and supported by connective tissue.

4. Functional Complexity:

* Tissues perform a single, defined function.

* Organs perform complex functions that are essential for the survival of the organism. For example, the liver filters blood, stores nutrients, and produces bile, requiring the coordinated action of various tissues.

In essence, organs are like miniature "factories" within the body. They are built from various "machines" (tissues) that work together to produce a specialized product (organ function).

Let me know if you'd like more examples or further clarification on any of these points!