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The main group of plants that live in the sea are called seaweeds. You can see lots of seaweeds scattered along the beach that have been washed up by the tide. Seaweeds need lots of sunlight to grow, just like plants that grow on land.

However, there are some big differences between seaweeds and land plants; they have no roots, leaves or flowers. They can absorb all the nutrients they need to survive from the water!

There are over 5,000 different species of seaweeds in the oceans. They can grow in all different shapes, sizes and colours. Giant kelp is the largest plant that grows in the oceans. It can grow up to 100 metres tall!

Just like plankton, seaweeds are very important to life in the oceans. Many of the small animals in the oceans feed on seaweeds. Seaweeds are also habitat to all sorts of different marine animals e.g. starfish.