Question

Explain the habit, external characters of Star Fish.

Answer 1

Answer:

Starfish are marine invertebrates. They typically have a central disc and usually five arms, though some species have a larger number of arms. The aboral or upper surface may be smooth, granular or spiny, and is covered with overlapping plates.

Explanation:

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Answer 2

Answer:

The starfish are invertebrate creatures, which make up a large group of marine species, where cucumbers and sea urchins are probably the most common.

It is also necessary to clarify that the starfish are not fish; they are Echinoderm, which belong to the Asteroidea class.

Explanation:

The starfish are born in the form of larvae, and once they break off from the egg, they start their maritime life, where they remain larvae until they are five years old. At this age they finally become adults, with a life expectancy which ranges between ten and thirty years. Everything will depend on the class they belong to.

There are more than 2000 species of these animals scattered throughout the oceans, which can never remain in fresh water. The starfish are carnivorous creatures whose diet is based on crustaceans and mollusces

The stomach of the starfish has the peculiarity of being able to extract food from the outskirts of the body, since it is completely flexible and can make outward movements to catch its prey and then return to it.

The starfish usually have 5 arms with ambulacral grooves , although there are also specimens with 20 arms.

Each arm is formed by an internal blister and an external podium or “feet”.

On the underside of the starfish, they have what are called the tube feet, which possess suction cups. These tube feet allow starfish to cling  to rocks as well as move along the ocean floor.

This is located in the middle of the oral disc; and it is strategically bordered by a peristomial membrane, which is formed by a sphincter. It has a small esophagus, which is directed exactly to the stomach, where there is a division of two parts in common which are the cardiac stomach, and the pyloric stomach.