11) Humans are warm-blooded organisms that maintain a constant body temperature around 37°C. The diagram shows the changes that take place to keep human body temperature constant. Brian claims that only the muscular system is involved when body temperature drops. He says that shivering occurs when the body’s muscles contract rapidly, producing heat, and that this muscle action keeps the body warm. Identify two pieces of evidence from the diagram that either support or refute Brian’s claim.

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.