Starfish Research Paper

When we look up to the night sky, there are beautiful, sparkling things that can not be taken away to make a wonderful gorgeous night. There are the stars and the moon which make the night sky shining, shimmering, and have inspired people to paint and discover their special features. On the other hand, we also have stars which are close to us and are as fascinating as the stars up in the sky; they are called: sea stars.

Sea stars used to be known as the starfish because aquamarine scientists have decided to change their name, due to the fact that starfish are not fish but closely related to sea urchins and sand dollars. Although sea stars live underwater and are commonly called “starfish,” they are not fish. They do not have gills, scales, or fins like fish do

This is useful because when sea star is threatened by a predator, it can drop an arm to get away. Sea stars house most of their vital organs in their arms, so some can even regenerate an entirely new sea star from just one arm and a portion of the sea star’s central disk, but unfortunately, this process may take a year to be completed. More facts are sea star have another special ability which is the consumption of their prey outside their bodies. They can pry open clams or oysters by simply using tiny, suction-cupped tube feet. Then the sack-like cardiac through their stomach emerges from the mouth and oozes inside the shell. After that, the prey is being enveloped by the stomach so that the prey can be digested, and finally sea star will withdraw their stomach back into the body. Several species have specialized feeding behaviours including eversion of their stomachs and suspension feeding. A special feature of the sea stars is that they have two stomachs. The cardiac stomach eats the food outside a sea star’s body. When the cardiac stomach comes back into the body, the food in it is transferred to the pyloric stomach.