Answer:
A poem indeed can have an AABB rhyme scheme, there is no rules to rhyming poems (except that it needs to rhyme with a flow). Yes a 3 stanza poem can have an AABB rhyme scheme for example...
Twinkle twinkle little star
How I wonder what you are
Up above the world so high
Like a diamond in the sky
--
Upon a nice mid-spring day
Let's take a look at Nature's way
Breathe the scent of nice fresh air
Feel the breeze within your hair
Explanation:
As Morrie's body deteriorates, so does the condition of the hibiscus plant. The plant's pink petals wither and fall as Morrie grows increasingly dependent on his aides and on oxygen. As his death approaches, so does the death of the plant. It is continually used as a metaphor for Morrie's life and for life itself.
Can it be based on anything ?