Ineed cyanobacteria formed colonies called stromatolites. these used to be plentiful. what role did they contribute to the atmosphere?

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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