#4. The ocean makes Earth habitable.
a) Most of the oxygen in the atmosphere originally came from the activities of photosynthetic organisms in the ocean.
b) The first life is thought to have started in the ocean. The earliest evidence of life is found in the ocean.
a) Most of the oxygen in the atmosphere originally came from the activities of photosynthetic organisms in the ocean.
b) The first life is thought to have started in the ocean. The earliest evidence of life is found in the ocean.