Environmental Science , biology homework help

Write three short responses of approximately 125 words each (approximately 375 words total) that answer each of the following questions:

- What are the major factors that contribute to environmental problems on a global scale? Why are these factors unsustainable?
- What is the difference between a scientific law and a scientific theory? How do scientists arrive at these conclusions, and what are the limitations of scientific research?
- Where do humans get the energy that they use to maintain their existence, such as eating, working, and having a family? In your answer, address the difference between renewable and nonrenewable resources.