Describe in your own words what cell respiration is and why it is needs

The cell respiration is a process in which the sugar molecules in the human body are broken into a form of energy which can be utilized by the cell. The cell respiration is needed to build up the adenosine triphosphate (ATP) and then it releases waste products from the cell. For this biochemical process, the cell uses oxygen hence, this process is also called aerobic respiration.

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b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.