Variable - anything you can change in an experiment that might affect the outcome. Independent variable - The variable that you change. What you know before doing the experiment. The independent variable in the example below is “Type of Exercise”. Dependent Variable – The variable that change on its own in response to the change in the independent variable. This is what you find out by doing the experim ent. The dependent variable in the example below is “Heart Rate”. Controlled Variable – Any variable that you don’t change during an experiment. The controlled variable in the example below is the 10 minute duration. Example: Type of Exercise (10 minute duration) Heart Rate Walking 70 beats per minute Jumping in place 85 beats per minute Running 110 beats per minute
C: carbon and oxygen cycles are the most closely related in their role in sustaining life because they both include processes of exchanging themselves among different parts of the earth. E.g. they both process through the ground, in the air, etc.
