The smallest animal-protozoa code H39, such as paramecium, green eye worm, Babesia, flagellate, sporozoa, amoeba, marsupials, nematodes, ciliates, etc. All belong to single-celled animals. They are all very small and can only be calculated in microns (1000 mm) and can only be seen under a microscope. Protozoa also have a larger variety. For example, a trumpet worm living in stagnant water, a spiral worm that looks like a snake, is l-2 mm long and visible to the naked eye. There is a kind of protozoa living in rotten wood, with a thin body and a body length of L meters. Paramecium is relatively large, about 300 microns long, green eye worm is about 30 microns long, and Babesia is even smaller, only 3 microns long. Compared with the largest animal, the blue whale, its size is more than 30 million times different. What is the diameter of a hair? About 70 microns. Ba Bethea is only 1/20 as thin as a hair. The small hole of the slender sewing needle is only a few hundred microns thin, which is very small to the naked eye. However, if sporozoa, Babesia, etc. If they are allowed to make holes, they will think the holes are too big! Sporozoa is parasitic on the esophageal wall of sheep. It also invades the lingual muscle, intercostal muscle and myocardium. , gradually increase, and finally become a capsule. The capsule has two layers of capsules, which divide into many small balls, and finally form kidney-shaped or half-moon spores, which will produce Sarcocystis. This toxin is fatal to rabbits. Babesia is transmitted by ticks and parasitized in blood cells of mammals, causing serious animal epidemics. Babesia bovis can cause hematuria in cattle, and Babesia canis can cause jaundice and hematuria fever in dogs. Babesia is not the smallest animal. Smaller animals are silkworm particles, only 0.5 micron long, which is equivalent to1140 of the diameter of a hair. In the cells of a silkworm baby, hundreds of silkworm particles can be parasitic, causing silkworm diseases. Silkworm particles are spread by silkworm eggs and silkworm feces and enter the digestive tract of silkworm, and spores develop into tiny deformed worms. Amoeba invades the cells in the digestive tract wall, divides and proliferates, spreads throughout the body through blood, and finally forms spores. Spores are ovoid with a "polar capsule" with long polar filaments. There are animals smaller than silkworm particles, which are single-celled animals similar to pleuropneumonia in protozoa. It is only 0. 1 micron long, and one of them, code name H 39, has a maximum diameter of 0.3 micron, which is much smaller than Babesia. It is estimated that there are 1000 trillion pieces put together, which is 1 gram. /zui/z4.htm