Explanation:

Kelps currently occur on rocky coasts throughout the Arctic. The longest kelp recorded in the Arctic in Canada was 15 metres, and the deepest was found at 60-metre depth (Disko Bay, Greenland). Many find it surprising that marine plants can grow so well in harsh Arctic environments.
Kelps have adapted to the severe conditions. These cool water species have special strategies to survive freezing temperatures and long periods of darkness, and even grow under sea ice. In regions with cold, nutrient-rich water, they can attain some of the highest rates of primary production of any natural ecosystem on Earth.
Kelps function underwater in the same way trees do on land. They create habitat and modify the physical environment by shading light and softening waves. The underwater forests that kelps create are used by many animals for shelter and food. More than 350 different species — up to 100,000 small invertebrates — can live on a single kelp plant, and many fish, birds and mammals depend on the whole forest. Kelp forests also help protect coastlines by decreasing the power of waves during storms and reducing coastal erosion. A lot of kelp break off or are dislodged from the rock they attach to and end up in nearby habitats where they fuel deep food webs.