Shrimp turns green because it is polluted by bacteria. Some bacteria can continue to reproduce and grow at low temperature, which is harmful to human body after eating. Shrimp is a crustacean decapod swimming suborder with nearly 2000 species, most of which live in rivers and lakes. They all have beards, hooked noses, jointed back arches and hard scaly feet at the tail, so they are good at jumping. Many kinds of food are important. The size varies from several meters to several millimeters, with an average of 4 ~ 8 cm. The big one is called prawn. Bending the abdomen and tail can swim backwards quickly. Eat tiny creatures, and some eat carrion. Shrimp is long and flat, with a calcareous exoskeleton, which is divided into two parts: chest and abdomen. The head and chest are covered with carapace. The abdomen consists of seven body parts. There is a serrated forehead sword and 1 double rotatable compound eyes with handles at the front end of the head breastplate.
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Life habit of shrimp: shrimp is good at swimming. When it swims, its swimming feet paddle back frequently and neatly like wooden paddles, and its body slowly drives forward and backward. When frightened, its abdomen bends and stretches flexibly, its tail strokes down and forward, and it can jump backward continuously at a very fast speed. The gill of shrimp is located in the gill cavity formed on both sides of the crustacean, and the front, rear and ventral surfaces of the gill cavity are communicated with the outside world. Most of the branches are pinnate, with 25 pairs of * * *, which are attached to the chest side wall or the base of the chest limb. The epidermis is extremely thin, and gas exchange occurs when blood flows through gills. The jaw boat in the gill chamber swings constantly, so that fresh water enters from the back and abdomen and flows forward.
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