Cockroaches are omnivorous insects and will never choose to eat them. Most cockroaches live in nature and are an important part of the food chain. Many animals feed on them. In addition, cockroaches in nature can decompose organic matter, so that nitrogen in organic matter can naturally return again and be used by plants. Cockroaches play an important role in nitrogen cycle.
Cockroaches living at home with humans can easily find food, and kitchen garbage is the main food source. Human hair and nails can also be food.
After hundreds of millions of years of evolution, cockroaches can adapt well to the environment. Cockroaches can live for half a month without food and water. If there is water, they can live for a month. Cockroaches rely on the breathing holes in the abdomen and have an open circulatory system, so they can survive for half a month in the case of decapitation and eventually die of thirst.
In addition, strong reproductive ability is another main reason why cockroaches can reproduce on the earth. Once fertilized, female cockroaches can produce fertilized eggs all their lives. Because it will become a female fuselage state. Females can produce fertilized eggs every other week and thousands of offspring every year, thus ensuring the sustainability of their race.
Almost all environments of rats can be adjusted. Dirty water, dark sewers, delicious food and moldy garbage dumps are all their lives, not to mention human habitation. On an island called Ezikik, it was used as the basis of the initial bullet experiment. A huge pop-up window was left on the island, and all animals could not survive because of the radioactive material of the atomic bomb.
But a few years later, when people came to this wasteland again, they found a very good mouse. Being able to survive in such an environment, life is already very good, and it cannot be said to be a terrible miracle. Third, mice have an excellent appetite. They eat almost everything, and can rely on all kinds of food for survival and reproduction, so rats can use human food and other favorable conditions for reproduction.