Starfish's mouth is in the middle of its lower body, which can directly contact the surface of the object that starfish has climbed. Starfish have a strange star-shaped body. It usually has five long tentacles on its disk-shaped body, but it can't see its eyes. People always think that starfish rely on these tentacles to tell their directions, but they are not. Studies by American and Israeli scientists have found that starfish are "monitors".

It turns out that there are many tiny crystals on the echinoderm skin of starfish, and each crystal can play the role of eyes. These crystals enable starfish to observe information in all directions at the same time and grasp the surrounding situation in time. Therefore, starfish is a real 007.

In addition, starfish can be divided into several parts. If you tear the starfish into pieces and throw them into the sea, each piece will soon grow back to the lost part, thus growing into several complete new starfish. Because starfish have such amazing regeneration ability, it is a trivial matter to break arms and limbs.

Extended data:

Environmental value of starfish;

Echinoderms, such as starfish, play an important role in marine carbon cycle, and they can directly absorb carbon from seawater during the process of forming exoskeletons. Echinoderms are invertebrates living on the seabed, which are divided into five categories: starfish, sea urchins, snakes, sea cucumbers and sea lilies, and their figures cover all oceans.

It is found that echinoderms absorb carbon from seawater and form exoskeletons in the form of inorganic salts (such as calcium carbonate). When they die, most of the carbon-containing substances in their bodies will remain at the bottom of the sea. In this way, echinoderms absorb about 654.38 billion tons of carbon every year.

After the greenhouse gases produced by burning fossil fuels enter the ocean, the acidity of seawater will rise, which will harm coral reefs and shellfish. This time, the researchers found that acidic seawater is also very harmful to echinoderms, making it impossible for such creatures to form a solid calcium-containing exoskeleton.

Baidu Encyclopedia-Starfish (Echinodermata Starfish)

China Com-Aiya Ocean Kingdom | Those amazing secrets about starfish.