Starfish belong to the same group of invertebrates that live in the sea.  These animals are echinoderms , which means …

Have you ever seen a jellyfish? It looks like an umbrella with projections, called tentacles, hanging down from the…

Put two or three pinches of table salt into half a glass of water and stir the water with a spoon. What happens? The …

There are plants in the seas and oceans as well as on land. Tiny plants and animals are part of a layer of millions of …