The term used to describe a group of tissues all carrying out the same function is organ.

Here's why:

* Tissues are groups of similar cells that work together to perform a specific function.

* Organs are made up of different types of tissues that work together to perform a more complex function. For example, the stomach is an organ made up of muscle tissue, epithelial tissue, connective tissue, and nervous tissue, all working together to digest food.

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