Which of the following events occurred about 1.2 billion years ago and resulted in an increased rate of evolution for earth’s life forms?

development of sexual reproduction

development of photosynthesis

emergence of single-cell organisms

accumulation of atmospheric oxygen

the endomembrane system is a series of compartments that work together to package, label, and ship proteins and molecules. in your cells, the endomembrane system is made up of both the endoplasmic reticulum and the golgi apparatus. these compartments are folds of membranes that form tubes and sacs in your cells.

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