What evidence tells you cells are part of a tissue?

• A. They are located in different organs.
• B. They look similar and are grouped together, so they should be able to perform the same functions.
• C. They contain different organelles.
• D. They are all dead.

Answer: (B)

Cells form tissues when they share a similar structure and work together to do a common job. When you see cells that look alike and are grouped closely in a region, it shows they’re specialized to perform the same function, which is what a tissue is. That grouped, similar appearance is the real clue that these cells belong to a tissue. If the cells were scattered in different organs, or they differed in their internal setup, or they were all dead, you wouldn’t have a tissue. So the best evidence is the uniform appearance and the organized grouping of cells into a coordinated unit.