Why are significant amounts of neutrons not found in a free state in nature?

This is due to the instability of the neutron; in a free state, it spontaneously converts into a proton, electron and electron neutrino.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.