What is the role of the gravity in the formation of the planets?

Explanation:

During the formation of planets, essentially, various matter and elements pulled and fused together (because of the gravity), forming planetesimals.

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.