Octopus (English name: Octopus) belongs to Octopoda. It is called "Eight Wrists" because it has eight wrists on its head, which are connected by membranes and have different lengths. There are two rows of sucker with no handle on the wrist, and the sucker has no handle. It is a marine animal. Octo- means eight in English.
Octopus body is short oval, cystic and webless; The boundary between head and body is not obvious. Octopus's head and body are about 7 ~ 9.5 cm, with large compound eyes and 8 retractable wrists. Each wrist has two rows of fleshy suckers. Octopus wrist is about 12 cm long, octopus wrist is about 48.5 cm long and octopus wrist is about 32.5 cm long. I usually crawl with my wrist, sometimes I swim by stretching my wrist membrane, so that I can hold other things strongly and use the funnel at the bottom of my head to spray water and retreat quickly. The base of the wrist is connected with a reticular tissue called the skirt, and there is a mouth in the center. There are a pair of sharp horny palates and file-like toothed tongues in the mouth, which are used to drill through shells and scrape off their meat.
Carnivorous, eating clams and crustaceans (shrimp, crab, etc.). ), there are some species that feed on plankton. This is not a question of whether it likes it or not, because the stable structural myoglobin is a necessary condition for octopus to survive in the deep sea. In order to compete for astaxanthin (astaxanthin for short) resources, it fights to the death with lobsters. Astaxanthin is the strongest antioxidant and a necessary condition to ensure the structural stability of myoglobin from oxidation. According to the accurate quantum calculation by Professor Francesco Buda, a scientist from Leiden University in the Netherlands, and his experimental team members in 2008, mature shrimp, crab and salmon are attractive bright red because they are all rich in astaxanthin, and the natural red substance of mature shrimp, crab and salmon is astaxanthin.
Octopus sucks water into the mantle, breathes it and excretes it through a short funnel-shaped tube. Octopus mostly crawls on the seabed with suction cups, but when it is frightened, it will spray water from the body tube, and the sprayed water flow is strong, thus moving quickly in the opposite direction. In case of danger, ink-like substances will be sprayed out as a smoke screen. Some substances can paralyze the attacker's sensory organs.
The vowel letter o is pronounced short. vowel/?/in stresses the closed syllable. When pronouncing, the tip of the tongue is close to the lower teeth, the back of the tongue is upturned, the gums are almost completely open, the mouth is wide and the lips are round. This sound appears at the beginning, middle and end of words, for example:
Bull (castrated)
October. October
Octopus octopus
On top (emphasizing contact)
Ostrich ostrich
Operation, operation
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