Final answer:
The four fields that tie everything together are the four basic forces in physics: gravitational force, electromagnetic force, weak nuclear force, and strong nuclear force.
Step-by-step explanation:
The four fields that tie everything together are the four basic forces in physics: gravitational force, electromagnetic force, weak nuclear force, and strong nuclear force. These forces work together to explain interactions between objects. For example, gravitational fields map gravitational forces, electric fields map electrical forces, and magnetic fields map magnetic forces.