When we think of ocean life, our minds typically pictures sharks, fish or whales, but rarely do we immediately picture seaweed. However, seaweed is all over the ocean and has been for more than 600 million years. It is not a true plant, but categorized as a non-vascular protist; this means that seaweed does not have a system to transport food and water, so seaweed makes its own food from the energy it gets from the sun. This process is known as photosynthesis. This makes seaweed an algae, in addition to the fact that it doesn’t have leaves, roots or stems.