The chromosome of eukaryotic is found in the Nucleus
A successful food web needs to have all of the organisms mostly bigger than the ones that they are eating otherwise the food web wouldnt neccessarily work properly and then the food webs would all be messed up.
The use of biomass energy is inefficient as compared to fossil fuels. Also, the use of such is harmful to the environment. Using animal and human waste to power engines may save on carbon dioxide emissions, but it increases methane gases, which are also harmful to the Earth.