Join the sentences, using 'who' or 'which'. a) The Earth is a planet. It can support life. b) The book is about a girl. She runs away from home

Join the sentences, using 'who' or 'which' .
1. The Earth is a planet. It can support life
2. The book is about a girl. She runs away from home
3. A dictionary is a book. It gives you the meaning of words