Question: list two reasons why algae are useful and important to life?
Answer: 1) Algae Grow Fast. ... 
2) Algae Can Have High Biofuel Yields. ... 
3) Algae Consume CO2. ... 
4) Algae Do Not Compete With Agriculture. ... 
5) Microalgal Biomass Can Be Used for Fuel, Feed and Food. ... 
6) Macroalgae Can Be Grown in the Sea.