The ans is - Ignorance
I am black as night but filled with light. I can be seen, even through a screen. I hold many secrets, waiting for them to be discovered. What am I?
I am born in the forests, In the cities I die, I swim all the oceans, And wander the sky. Though I'm numbered eighth, I should be named first, For without me you'd perish, For breath you would thirst. What am I?