` melody.

e^2lnx = e^{lnx^2}

And given that e and ln are opposite functions, e^{lnx^2} cancel out to just = x²

So you probably would simplify it down to x² = 2 x³ and then solve for x.

I'm not 100% sure though. Hope it helps.

I think what he meant to say is without photosyntheses, the larger multi-cellular could not evolve.

Well light is the needed for photosynthesis by plants, which are in turn needed for animals and other higher-order organisms. So I guess in that sense light is the initial energy source for almost all communities!