Answer: Renewable source of energy
Step-by-step explanation:
The algae can be used to produce biofuel. This is a alternative source of energy can be used in place of conventional sources of energy like fossil fuels. This emphasis towards the use of renewable source of energy as plant or algae can be grown again due to their seeds, spores or through any other vegetative precursors. This is the basis of sustainable use of non-renewable resources by the use of renewable resources.