Answer: Hydroelectric power, Solar, Geothermal, Wind and Biomass.
Explanation: Renewable energies such as hydroelectric power are used quite frequently in the United States and Canada. However, it is not the only one of this kind that they use since these countries have used other renewable energies such as: Solar, Geothermal, Wind and Biomass; which represent 10% in their use compared to the use of the main sources of energy such as: natural gas, coal and oil. However, it could be said that the use of renewable energy in these countries has been growing gradually.
A lake community with four trophic levels suddenly suffers from algal blooms. Using the strategy of biomanipulation, an ecologist may propose removing zoonplankton.
