How does the height of the sun in the sky and the length of the day change in autumn? What does this lead to?

During the fall, the height of the Sun decreases, while the length of daylight hours also decreases. The first half of autumn is the day of the equinox, when the day lasts 12 hours and is equal to the night. A decrease in the length of the day and the height of the Sun leads to the fact that the soil and plants receive less heat and light, they do not have time to warm up in a day, the temperature decreases, snow falls in late autumn in mid-latitudes, leaves fall from trees, and some animals hibernate.