Answer:
I am a word. I become longer when the third letter is removed.
I am flora not fauna. I am foliage not trees. I am shrubbery not grass.
I have all the knowledge you have. But I am so small that I can fit into your hands. What am I?
Fatherless and motherless. I was born without sin roared when it came into the world. But I never spoke again.
My teeth are sharp my back is straight to cut things up it is my fate.
I have feet on my head