Answer the following question given this paragraph: 

An organ is a structure composed of two or more types of tissues that work together to do a specific task. Most modern plants have several organs that help them survive and reproduce in a variety of habitats. Major organs of most plants include roots, stems, and leaves. These and other plant organs generally contain all three major tissue types.


Q: What do you call a structure composed of two or more types of tissues that work together to do a specific task?

 Choices:

- cell

- marrow

- system

- organ

A:
organ
