Fossils evidence shows that were the first photosynthetic organisms on earth, about 1.2 billion years ago.​

There is suggestive evidence that photosynthetic organisms were present approximately 3.2 to 3.5 billion years ago, in the form of stromatolites, layered structures similar to forms that are produced by some modern Cyanobacteria

False because when you are going on any water activities it is good to know if the water has any recreational illnesses its false on edgenuity also