Organism A eats 5 kcal of food each day. It uses 1.5 kcal for respiration, 0.5 kcal for biomass gain and 1 kcal is egested. Organism B also eats 5 kcal each day. It uses 2 kcal for respiration, 1 kcal for biomass gain and 1.5 kcal is egested. Which organism is more Effective?