Fungus.

I'm always amazed at seeing Fungi growing up through things like Tarmac!
Fungi must be Strong Guy!

There's fungus on my pizza!
There's fungus in my bread!
I think I'll eat some candy,
Or have some fruit instead!
Fungi aren't green plants,
They have no chlorophyll,
Can't make food from sunlight,
I'm sure they never will!
They break down so much garbage,
They make things decompose,
Returning things to Earth,
Help fertilize what grows!
Those are facts of fungi,
Some good, and some are bad,
A million types of fungi,
Without some we'd be sad...
Now each time I eat a mushroom,
Each time I bake with yeast,
'll go and thank good fungi,
They're quite a useful beast!