To estimate the rate of loss of plant cells due to grazing by animals, quantitative zooplankton samples are needed to determine the number of herbivores present. It is also necessary to measure their feeding rates. If the size of the animal population and its food requirements are known, it is possible also to make a calculation of the primary production necessary to support this number of animals. Feeding rates of zooplankton can be calculated from measurement of clearance rate of particles or ammonium excretion rates.
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.