Which of these principles is primarily responsible for the gravitational attraction between two masses?

Newton's Law of Gravity can be mathematically expressed as: $F=\frac{Gmmr}{r^2}$, where $F$ is the gravitational force, $G$ is the gravitational constant, $m$ and $m$ are the masses, and $r$ is the distance between the centers of the two masses.

Recognize that Einstein's Theory of Relativity provides a more comprehensive understanding of gravity, especially in strong gravitational fields, but Newton's Law of Gravity is primarily responsible for explaining the gravitational attraction between two masses in most everyday situations.