11. There is no net energy flow over one half cycle. 12. To create and build these structures consumes less net energy than comparable construction methods. 13. The energy return on energy invested is quite low, so it produces little net energy . 14. In this model, the currency being optimized is usually net energy gain per unit time. 15. This enzyme is activated during times of net energy usage and metabolic stress, including hypoxia. 16. India is net energy importer to meet nearly 45 % of its total primary energy. 17. Net energy is absorbed by an endothermic reaction.18. Thus, the currency in this situation could be defined as net energy gain per unit time. 19. The high net energy gain of this proposal derives from the Moon's much shallower gravitational well. 20. Therefore, many organisms convert ammonia to urea, even though this synthesis has a net energy cost.
