Write any four uses of bases

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How do scientists think that gravity affected the formation of our solar system?

Find the mass in grams of 1.37x1020 particles of h3po4

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?