Why is the earth round?

It's because the DNA that the planet earth is made of makes it want to grow that way

its like how our sun's dna made it a big fireball, or how jupiter was made some sort of cloud.

Yeah, I think that's how it works

I don't

Gravity pulls in the same in all directions, and spheres are the only shape that does that. The Earth is actually move of an oval shape becuase the center of the planet is pushed out a little as it revolves on it's axis.