Which of the following statements is true? biomass is a completely clean fuel. it doesn't release any harmful chemicals. wind energy is converted into transportation fuel for cars and other vehicles. almost 25 percent of the world's electricity is generated by solar power plants. hydropower plants can negatively affect the fish population in an ecosystem

The following statements are true:
Biomass is a completely clean fuel. It doesn't release any harmful chemicals. Biomass fuel is derived from biological matter such as dead plant matter and animal waste (manure). 
Almost 25 percent of the world's electricity is generated by solar power plants. In 2014, the actual percent of the world's electricity generated by solar power plants is 21%.
Hydropower plants can negatively affect the fish population in an ecosystem. In order to build Hydropower plants, you need to build dams and the dam wall prevents the free flow of fish and disturbs natural ecosystems