Cockroach vitality is not very tenacious

Generally, cockroaches that have been stepped on will not die immediately, and may wait until more than ten days later.

Khan, as the upstairs said, didn't the earth have long been ruled by cockroaches?

Are you torturing it?

Cockroaches possess incredible vitality, and their mysterious abilities seem to be related to genes.

This time, Sheng Li, a professor of entomology at South China Normal University, and others found that among all the insects that have been sequenced, the American cockroach has the second largest genome, second only to the flying locust. Interestingly, 60% of the genome of the American cockroach contains repetitive fragments.

Compared to other insects, they have a larger family of genes related to taste and smell. They found that the American cockroach had 522 taste receptors — and the German cockroach had a similar number, with 545. To avoid ingestion of toxic substances, they require a very sophisticated system of taste and smell, Schal says.

Cockroaches have the habit of eating, spitting, and excreting at the same time, and secrete odorous fluids, and in their activities, they can not only carry more than 40 pathogens such as mycobacterium leprae, Yersinia pestis, and Shigella dysentery. It is also an important vector for the transmission of intestinal diseases and parasitic diseases, and its secretions and feces contain a variety of carcinogens.

Cockroaches often hide in dark corners such as kitchens and bathrooms, which are not easy for people to notice, not only endangering storage items such as grain, oil, food, clothing and books, but also spreading diseases and causing harm to people.

Cockroaches are omnivorous insects that eat a wide range of foods. Cockroaches can fly, climb walls, and burrow. Diurnal and nocturnal, the sense of touch and smell is very sensitive, and the ability to protect itself is strong.

Cockroaches reproduce quickly and have a strong reproductive ability. A pair of cockroaches can reproduce 20,000 after a year. Cockroaches can lay more than 4-50 egg sheaths in their lifetime.

One egg sheath can hatch about 40 small cockroaches. <

1. Cockroaches are omnivorous insects, and they have a wide range of food types, as long as they are organic food, they can eat them.

2. Cockroaches can fly, climb walls, and be good at drilling holes. Diurnal and nocturnal, the sense of touch and smell is very sensitive, and the ability to protect itself is strong.

3. Cockroaches reproduce quickly and have strong reproductive ability. A pair of cockroaches can reproduce 20,000 after a year. Cockroaches can lay more than 4-50 egg sheaths in their lifetime. One egg sheath can hatch about 40 small cockroaches.

Cockroaches have very strong vitality, and the cockroach can still live if its two tentacles are cut off.

Manifestations of the tenacious vitality of cockroaches:

A biologist once came to a conclusion based on the ecological habits of cockroaches: if one day there is a global nuclear war on the earth, all living things in the affected area, including humans and even fish, will disappear, and only cockroaches will continue their lives!

This is because the amount of radiation that the human body can tolerate is normally 5 rems, and if the total radiation exceeds 800 rems, death is inevitable.

The German cockroach can tolerate 9,000 to 105,000 rems, while the American cockroach reaches 967,500 rems (rems indicates radiation dose. REM dose equivalent: Rem (REM) Xi [Walter] (SV) 1SV = 100REM) so cockroaches can survive even with nuclei **.

A decapitated cockroach can live for 9 days, and the cause of death after 9 days is excessive hunger.