In the end, fire does not matter, neither does water. It doesn't come down to thunder or lightning, wind or rock. It isn't because of night or day, the moon and the sun. But instead, because there is more to Planet Earth than the inorganic and that which lights it sky. The animals were the enzymes of the earth, they are the catalysts of change.
At the top of the stratification there are humans, and why? They are not stronger, they are not faster, the are not masters or stealth or agility. So how do they survive? They are clever, they are wise, they learn from one another, and their ability to adapt surpasses all other; for what other animal can adapt to survive on all seven continents, to move through the air, the sea and over the ground? What other can build and destroy? The answer is as simple as you might think...none, no other animal is such that it can accomplish all that homo sapiens have.
In order to fully understand this one must examine those among us who have the strength to drive us further, for with the rise of the Olympians we entered the 5th age: The Age of the Demigods.