Sea squirts belong to the phylum Chordata, subphylum Urochordata, and have a layer of tunic on the outside of the body, also known as tunicata, hermaphrodite, heterozygous fertilization, and are a group of invertebrates that are easy to observe; however, because the tail is still constructed with a chord and a dorsal neural tube in the juvenile stage, it disappears into a fixed life after growth and development, so it is also considered to be the most primitive chordate. However, because the tail still has a spinal cord and a dorsal nerve tube in the juvenile stage, it disappears after growth and development, so it is also considered the most primitive chordate. Most of the caecilians belong to Class Ascidiacea and Class Thaliacea. The former are fixed in the body and live singly or in groups, while the latter are free-floating in the ocean and live singly or in groups in a barrel-shaped body, with a complex life history of sexual and asexual alternation of generations. In addition to professional scholars, it is difficult for the general public to learn the identification of sea squirt species from illustrated books, but the basic type of Ascidiacea (Ascidiacea), but it is not difficult to be divided into two major categories of monomorphic ascidians (Solitary ascidi) and groups of ascidians (Colonial ascidi); monomorphic ascidians for the individual, and groups of ascidians is divided into groups of group ascidians (Social ascidi) and groups of ascidians (Social ascidi) and groups of ascidians (Ascidi) and groups of ascidians (Ascidia). ascidi) and composite groups of ascidians (Compound ascidi), the former individual each, individuals have their own capsule, but connected to each other at the base, the latter group of germination formation, group **** with the capsule, individuals have each of the inlet, but the outlet is concentrated together. The shape of the sea squirt is like an eggplant, some like a flower, the shape is very similar to a teapot. If you touch the sea squirt with your finger, it will shoot out a strong stream of water from the hole of the outlet pipe, and then from the original upright state and softly collapsed, so it is an animal. Ascidian is an animal that lives in a fixed position, and it is protected by a layer of cellulose like sheath outside of the body, so that the body can be protected and maintained in a certain shape. This is a unique phenomenon in the animal kingdom, and that is why the sea squirt is so named. The sea squirt takes in oxygen from the water through its gills and feeds on microscopic organisms in the water through its intestines by continuously sucking in water from the outside world and draining it from its body through the holes in its inlet and outlet tubes. This is called budding in sea squirts. Some sea squirts reproduce sexually, in which case they are hermaphrodites, but the eggs and *** do not mature at the same time, so auto-fertilization does not usually occur, and it is only the marriage between different individuals that gives birth. The newborn sea squirt resembles a tadpole, with eyes, a head, a well-developed tail, a central notochord, a nerve tube on the back of the notochord that reaches the front of the body, paired gill slits in the pharynx, and the little sea squirt is able to swim freely in the sea. However, after a few hours, the front of its body gradually develops protrusions and attaches itself to other objects. The tail then gradually shrinks to the point of disappearing, leaving only a single ganglion. Now scientists have discovered that the closest invertebrate to vertebrates, the sea squirt (Botrylloides leachi), also possesses this ability, a new discovery that could help mankind search for the regenerative abilities of vertebrates that have been lost or suppressed. Some scientists in Israel collected segments of the sea squirt's blood vessels and looked at them under a microscope, discovering the entire process of regeneration in the sea squirt. The cells first aggregate into a hollow sphere, then the layers fold inward and the organ develops gradually until it grows into an adult sea squirt with the ability to reproduce after two weeks. Scientists marveled at the fact that a sea squirt that had survived the storm with only a single blood vessel could regenerate an entire colony. What an advantage this regenerative ability provides! While other animals trigger regeneration from a central point, sea squirts can emerge from many locations. The regenerative ability of the sea squirts is very strong. Scientists believe that this discovery may shed light on a regenerative ability that has been lost or suppressed in vertebrates. People drink too much alcohol, the body produces harmful reactive oxygen species, resulting in peroxidation, affecting liver function, which is the main symptom of a hangover, the results of experiments found that the sea squirt liver has the ability to inhibit the reactive oxygen species of chemical substances, found by the rat experiments, the rats fed the sea squirt liver, the body of the lowest degree of oxidation, so the researchers are ready to further research, hoping to confirm the sea squirt function of the antidote to alcohol. Image reference: nehs.hc.edu/~wbjie/SeaSquirts/Compound/DSC_0015 Benthic composite group sea squirt (Compound ascidi) Image reference: nehs.hc.edu/~wbjie/SeaSquirts/Social/P4100053 Benthic Swarming groups of sea squirts (Social ascidi) nehs.hc.edu/~wbjie/SeaSquirts/ kepu/big5/lives/water/life/life_5 epochtimes/b5/7/4/6/n1669963 fish/chinese/ magazine/magazine-55h

Reference: Thank you for the opportunity to learn about sea squirts

Sea squirts are sessile animals

that are sheathed in a plant cellulose-like capsule

that protects the body and maintains its shape. This is a phenomenon unique in the animal kingdom

The sea squirt is named after it. ... Some sea squirts give birth

to a bud on their body

which grows out of the mother's body

and develops into a new individual.