Number the following events of plant evolution in sequential order: 1. 1 multicellular organisms appear. 2. 2 bacteria can conduct photosynthesis, releasing oxygen into the atmosphere. 3. 3 bryophytes appear. 4. 4 seedless, vascular plants appear. 5. 5 life is able to produce its own food. 6. 6 gymnosperms and angiosperms appear. 7. 7 eukaryotes appear.