Respuesta :

XXSavageForLifeXX
by organisms i hope you mean living because the first to die off would be plants this is because they get their food from photosynthesis which occurs with sunlight. and then eventually everything else would die because the plants make oxygen for us to stay alive.
~hope i helped 
Cutiepatutie
Organisms that utilize photons and nutrients from the abiotic environment.

Hope this helps, have a nice day! :-)