Some Eukaryotic cells have internal structures that are able to use photosynthesis to convert light energy into chemical energy (as bonds in sugars). Why is this capability not found in all Eukaryotes? a. Once organisms are capable of eating and gaining their energy from consuming other organisms, energy from the sun is no longer needed in a contained ecosystem. b. The endosymbiotic event that brought chloroplasts into Eukaryotic cells actually happened after Eukaryotic lineages diverged so many lineages never actually possessed chloroplasts. c. The energy output from photosynthesis is not enough to support large and complex lifeforms d. Once mitochondria were incorporated into Eukaryotic cells, the need for chloroplasts was lessened e. As photosynthesis requires light, organisms that are active at night have less selective pressure to maintain chloroplasts within their cells. As such, after many generations, chloroplasts were lost from the cells and this is why we see so many organisms without them today.