energy from the sun is the source of energy for nearly all life on earth
producers use energy transferred by light from the sun to make food during photosynthesis
some of the glucose is used by plants and algae to make biological molecules
biomass is transferred through a food chain in an ecosystem when organisms eat other organisms
efficiency = biomass transferred to the next level / biomass available at the previous level X 100
biomass transferry efficiency is never 100% because the animal sometimes doesn't eat every part of the animal ; all of the nutrients aren't absorbed or some of the biomass is converted into other substances