Everlasting

In the world, only God is everlasting, and no one has ever seen God. Humans and animals are not everlasting and can only live for a certain period of time. When their time comes, living creatures disappear from the world, and they are buried under the soil, becoming food for worms.
When we are alive, we have blood, flesh, and a soul. We experience both pain and happiness and can defend ourselves against others' attacks by our power. Even a city that might have been prosperous a thousand years ago could be a desert or a city of rubbish today. Natural disasters like earthquakes can destroy entire areas.
Today, there are many islands in the sea that resulted from sea-earthquakes. In a hundred or a thousand years, another sea-earthquake may occur, causing all these islands to sink under the sea.
Somewhere in the world, there are many old trees that are thousands of years old, but they too will eventually disappear one day, unknown to us.