What is the main function of a nephron? A) It breaks down red blood cells to form nitrogenous wastes.
B) It absorbs digested food from the contents of the small intestine.
C) It forms urea from the waste products of protein metabolism.
D) It regulates the chemical composition of the blood.

In 2015, about ten percent of total u.s. energy consumption was from renewable energy sources. renewable energy plays an important role in reducing greenhouse gas emissions. when renewable energy sources are used, the demand for fossil fuels is reduced. sanjay and his family want to cut back on their use of non-renewable resources at home. they are thinking of an alternate way to heat their home without adding more greenhouse gases or pollutants to the environment. which renewable resource would not fit into their plan? a) solar power b) burning wood c) constructing a wind turbine eliminate d) generating hydroelectric power