Is there a greek god or goddess of gravity?

Explanation:

I'm certain not. The Greeks were far too earthy to conceive of a force that does not act through a rigid media.

I know that sentence is a mouthful: what it means is that if you took a pole and placed one end of it below the center of gravity and pushed, the Greens could understand something like that.

They would know that the pole is connected to you and you are supplying the force. If you push hard enough, the rock moves.

It was not until Newton was sitting under the apple tree that gravity took a real big step in disclosing what it was -- about 2000 years after the last Ancient Greek was buried. Gravity was something far different to Newton than it was to the Greeks (and Romans).

Sorry. No God or Goddess for that property. The Romans did no better.  You might want to search out what the Bible has to say. It seems to me they knew it wasn't a tortoise holding up the earth which is sort of related to any discussion on gravity.

I believe you are talking about evolution

Explanation:

When many species evolve from a single one it is usually referred to as evolution.