Knowledge.1 .There are more than one thousand kinds of seaweed.2. The biggest seaweed in New Zealand can grow up to 70 metres high.3. The smallest seaweed is as small as your little finger nail.4. Seaweed is an algae that grow in the sea.ComprehensionThis book is about undersea gardens it has seaweed,coral,fishthere is more than one thousand seaweed types in New Zealand the smallest seaweed in the world is the size of your little finger nail and the biggest seaweed is 70 meters high. Air bladders help to hold the blades upright in the water the blades are the leaves of the seaweed they take in sunlight to help the seaweed to grow.