During Photosynthesis, what does a producer take in from the air?

Idon't understand what to put on the left lines i'm confused can anyone ?

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?

Identify arrows pointing to bonding electrons. done h-0-0-h ) intro