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Principle_4_K-2, Life started in the ocean The first life on Earth lived in the ocean. The first life was microscopic., Life started in the ocean Living things are mostly made of water, The ocean provides habitats for many different species living on Earth. Some animals live where there is light in the ocean. Others live deep in the sea where it is dark., The ocean provides habitats for many different species living on Earth. Animals that live in the ocean have features that help them to survive and be successful there. (see OL 5), The first life on Earth lived in the ocean. The first life was microscopic. These tiny microscopic organisms were the ancestors of all the larger organisms on Earth including those that once lived on Earth and those that live on Earth today., The global weather is affected by the ocean. Our local weather including rain, fog, and wind can be caused by the ocean., Most of the fresh water on land comes from water that evaporated from the ocean Life does not exist without water., The ocean is in constant motion. Seeds and young animals travel around the world in ocean currents., 4a. Most of the oxygen in the atmosphere originally came from the activities of photosynthetic organisms in the Ocean. We get over 50% of the oxygen we breathe from the ocean., We get over 50% of the oxygen we breathe from the ocean. Most of the oxygen we breathe comes from plants living in the ocean.