Why do cicadas die in autumn? Why? Who has the exact answer?

Cicadas finished their love symphonies in autumn and died after having offspring. The following is the exact answer. * * * Your references. The male cicada keeps singing every day to lure the female cicada to mate. To the female cicada, the male cicada sounds like a wonderful music. After mating and fertilization, the female cicada pricks a row of small holes in the branches with a sword-shaped ovipositor and lays her eggs in the small holes. A few weeks later, both male and female cicadas died. The larvae hatch from the eggs and stay on the branches. Autumn wind blows them to the ground. As soon as they reach the ground, they immediately find soft soil to drill down to the edge of the roots and suck the sap of the roots for a living. At least two or three years, more than ten years, from larvae to adults, they have to molt five times, four of which are underground, and the last time is the yellowish shell (this is the cicada shell) that crawls out of the soil and climbs to the tree to molt. It can be seen that cicada is an insect that can't see the light. Although they live for a long time, they rarely live in the sun and spend almost all their lives in the dark underground. I'm sorry.