Can a M-class planet survive in a nebula if with a small star?

Yes, an M-class planet can survive in a nebula, especially if it orbits a small star. The planet's ability to maintain its atmosphere and conditions for habitability would depend on factors such as the density and composition of the nebula, the intensity of radiation from the star, and the planet's distance from the star. If conditions are favorable, the nebula might even provide some protection from cosmic radiation, allowing the planet to thrive.