Which best explains why an mri is useful for diagnosing cancer but ineffective in treating it?

Magnetic resonance imaging (MRI) is an imaging tool designed to create detailed, cross-sectional pictures of the inside of the body. Using radiofrequency waves, powerful magnets and a computer, MRI systems may distinguish between normal and diseased tissue. MRI is just a scanner it's not and never will be meant for treatment  that's why its gonna be ineffective treatment.

Ocean currents are continuous, direct movements of the ocean. They reside on the ocean's surface and at its depths. Winds, water density, and tides all drive this movement.