5. Read the text below and answer the questions.
Biomass energy is electricity that is generated by burning organic matter. Organic waste such as crop, animal, food, yard, and wood waste can all be used as sources of biomass energy. In a biomass energy plant, organic matter from plants and animals is burned to create steam. This steam then turns a turbine, which in turn generates electricity. Sources of biomass energy are abundant. However, its production is expensive, and it also emits greenhouse gases.
a. What kind of materials can be used to generate biomass energy?
b. What are the advantages of biomass energy?