When moving upward on an energy pyramid from one level to the next, what happens to the usable energy in an
ecosystem?
It increases by about 10%
It increases by about 90%
It decreases by about 10%
It decreases by about 90%

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?