They converted carbon dioxide to oxygen. The increased oxygen levels allowed for cellular respiration to occur instead of only glycolysis. The atmosphere became thinner, decreasing temperatures of the planet as well.
Different structures of cells can exist within the same organism. Different structures of cells may be indicative of different organelles presents different structures mostly arise due to different functions of the cell, as how structure of cells always complement the function of cells hence it is most it is mostly likely the last option that the cells have different functions
96 kelvin = about -177 Celsius so A
A; information in the DNA of the nucleus can tell skin cells how to develop and perform special functions, which cause a group of these cells to perform similar functions and become skin
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