Plz help with this digestive system

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?

Table sugar completely dissolved in water is an example of a?