Why is this the answer?

The answer is death because this clever riddle uses tricky language to talk about big, serious ideas about life, time, and the universe. A good riddle is like a secret code hiding the answer right in the question. Let us break the riddle into two parts. The first part asks, "What begins and has no end?" This is a philosophical clue, which means it makes you think about huge ideas. Many people think this refers to life itself. Your own life began when you were born. But if you think about the idea of life across the whole world, it never truly ends. It keeps going in a big, endless cycle with new things being born and new plants growing all the time. The idea of existence itself has a beginning a long time ago, but it continues without an end. The second and most important part is, "What is the ending of all that begins?" This is where the simple answer, death, fits perfectly. Think about everything you can name that has a start. A movie begins and then it ends. A piece of music begins and then it stops. The riddle is asking for the one single thing that is the unavoidable stop sign for all living things. Everything that begins a life must eventually end that life. The word death is the final action for every person's life that began on their birthday. It is the final punctuation mark on a wonderful story. This makes "death" the perfect answer for both clever parts of the riddle.