Despite the availability of cleaner energy sources, most of the energy used to power american homes comes from the burning of fossil fuels such as coal and oil. the burning of fossil fuels releases carbon dioxide into the air. carbon dioxide is a greenhouse gas that contributes to climate change. why do you think it’s a challenge to reduce fossil fuel usage in homes in the united states? how could the use of fossil fuels affect the biodiversity in neighborhoods and the surrounding ecosystems?

Coquina, a type of limestone, forms from shell fragments that settle on the ocean floor. what type of rock is coquina?

Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.

Ineed to get this test done which of the following statements is correct in hour our immune system responds to a potential pathogen? a.) the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. b.) b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c.) the adapted immune system will call on the innate immune system to destroy the pathogen. d.) the t-cells in the adapted immune systems are the first to recognize the pathogen