Heterotrophs take in mass in the form of food. food is either used to build molecules within the body or as fuel for cellular respiration. if used for cellular respiration, this mass will eventually be converted into carbon dioxide, and

the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.

the answer you are looking for is the united states forest service.

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