Choice 1 would be correct
Cyanobacteria use water, carbon dioxide, and sunlight to create their food, and expel oxygen as a by-product. The real significance of stromatolites is that they are the earliest fossil evidence of life on Earth. ... They were the first known organisms to photosynthesis and produce free oxygen.
Answer:
C) there is the land surrounding the country on all sides
the answer is the American system promised to help transport crops to northern markets.
