10. is a major component of all organic compounds, including carbohydrates, lipids, proteins, and nucleic acids. 11. What is an important component of the atmosphere and is dissolved in oceans?
12. Why are coal, oil, and natural gas referred to as “fossil fuels”?
13. List 1 natural way and 1 unnatural way that carbon dioxide is released into the atmosphere.
Use the Carbon Cycle Figure (and/or view Figure 3-17 in the textbook) and answer the following questions (you need to be able to view the figure in color):
14. Describe what Carbon Cycle actions occur under:
Biological processes
Human processes
Geological processes
Physical/Chemical processes

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

answer; three;