Some data suggest that the average global temperature will increase by 1°C-2°C by the year 2050. If this occurs, a major concern for humans would most likely be that

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.

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.