The Billion Year Spree

I was less than a virus in a rock falling towards Earth. I fell into the world ocean of the planet and became more than I was. I was a mushroom growing across the landscape before the first plant was created. I breathed oxygen through my gills and knew I would be more when my fruit began to rot.

I crawled upon the land and shed my gills but my young still needed the water to grow in.
I could be more and took to the air on transparent wings. I became giant beasts of the land and eons later became a master of imagination in human form.

I am life. I am a force of nature. I am infinite imagination. If I die I will be reborn. I am eternal.