Which is true of all organs in the human body? they are made up of two or more tissue types. they produce red and white blood cells. they remove harmful substances from the body. they are composed of one main type of cell.

They are made up of two or more tissue types.

Explanation:

Cells make up tissues when the perform similar functions.

Tissues performing similar functions make organs while organs performing different functions make a system.

As such, considering all options, the right answer about all organs in the human body is that they are made up of two or more tissue types.