Why is the sun called the center of the solar system?

The Sun Is called the center of the Universe Because It has a gravitational pull on All The objects around it hence why they call it the center of the universe      

Explanation:

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desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.