How is the passage being organized? How did you know?

The passage is being organized into a textual structure called proposition/support.

When reading the text presented above, we can see that this text is organized in a textual structure called proposition/support.

Textual structure refers to the way the text is organized and we can see that the structure used in this text is the proposition/support, because the author starts the text by presenting the proposition that avoiding reading and not stimulating the habit of reading can provoke problems for an individual, as this will cause a mental weakening over time.

To reinforce this idea, the author begins to present supporting sentences throughout, which show how reading is important for the brain and how it optimizes the lives of individuals, in addition to providing other benefits, proving that the habit of reading should be stimulated and maintained.

You can find more information about what a textual structure is at the link below:

i'm a frog i'm a frog i read about frogs i breath thee frogs the frogs are great but not me