A vigorous excersie that requires a lot of energy
        
             
        
        
        
<span>aerobic respiration requires oxygen.</span>
        
             
        
        
        
Secondary or second-level consumers eat primary consumers. Tertiary or third-level consumers eat lower-level consumers and are sometimes called final consumers. Some secondary and tertiary consumers eat plants as well as lower level consumers, making them omnivores.
 
        
             
        
        
        
Regarding cellular phones, the <u>electronic serial number (ESN)</u> is a code used to reset a forgotten pin.
- An electronic serial number (ESN) is the distinctive identification number that the manufacturer embeds or inscribes on the wireless phone's microchip. 
 - The ESN is automatically sent to the base station each time a call is placed so that the mobile switching office of the wireless carrier can verify the legitimacy of the call. In the field, the ESN cannot be easily changed. 
 - The mobile identification number (MIN), which is used by wireless carriers to identify phones on their network, is different from the ESN.
 - To aid in preventing fraud, MINs and ESNs can be electronically checked.
 
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