Sex produces organisms different from the parent. There is a good chance that some of those offspring will thrive no matter what new conditions occur. Many organisms can reproduce both sexually and asexually. Humans for example can only reproduce sexually.
One is the worldâs most famous teenager, with Â£17million in the bank. The other works part-time in an electronics store for Â£5 an hour, and relies on his mum to give him lifts to school. Meet Miley Cyrusâs half-brother Christopher, 17, above. Although there are just eight months between them and they share the same father, Miley and Christopher are worlds apart.
She's a mini Miley: Noah Cyrus, 15, is the spitting image of her famous sister as she attends red carpet event with dad Billy Ray. She has one of the most famous siblings in the world, so it's little wonder that Noah Cyrus is a little inspired by her sister Miley when it comes to her fashion choices.