Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: Specialized cells may be organized into tissues. A tissue is a group of cells of the same kind that performs the same function. For example, muscle cells are organized into muscle tissue. The function of muscle tissue is to contract in order to move the body or its parts. Answer: tissue
A:
What do you call a group of cells of the same kind that performs the same function?