The mantis is a very ancient animal that once lived in the same era as the dinosaurs. After hundreds of millions of years of evolution, the dinosaurs have long been extinct, but the life of the mantis continues to this day. This shows that the mantis has a very tenacious vitality. The body of an adult mantis is larger in the female and smaller in the male. Autumn is their breeding season. When the mating is completed, the female mantis will clamp the male mantis's head firmly with her front feet, and then eat her husband one bite at a time. So why does the female praying mantis do this? It turns out that in the natural environment, the protein that female praying mantises need physiologically can only rely on captured small insects, which is far from enough. In order to lay full eggs and raise healthy offspring, a female praying mantis must eat at least four or five male praying mantises to meet the required nutrients. And the male mantis will die of exhaustion after laying eggs. Therefore, both female and male praying mantises must dedicate their lives to the next generation.
Why does one earthworm turn into two after being cut off?
Earthworms are very common animals. They burrow in the soil and loosen the soil. They are our good friends. From a classification point of view, earthworms are a kind of lower annelid . It has a head and a tail, as well as mouth, stomach, intestines and other organs. The whole body is like a threaded tube with pointed ends. The earthworm's body is cut into two parts, and in a few days it will become two complete earthworms. This is because after the earthworm is cut into two pieces, the muscles on the incision will contract while forming new cell clusters to close the wound. At the same time, some undifferentiated cells in the body quickly come for reinforcements and form regenerative buds together with new cell clusters. The body's internal organs, nervous system, blood vessels and other cell tissues reproduce through a large number of divisions. It quickly grows into the regenerated buds, and after a while, a new head grows out of the missing section. A new tail grows from the missing section of the tail. This called "regenerating" earthworm is a nocturnal animal. In summer, eight o'clock in the evening to four o'clock in the morning is the peak period for their travel. It should be noted that earthworms do not have eyes and ears. Many cells in the skin of their bodies enable them to sense earthquakes, noise, light and darkness.
