Are there other planets like Earth in the Universe?

What makes a planet habitable? How many other habitable planets are there? Could the existence of habitable planets mean there is other life in the Universe? For free home activities sign-up at www.WhoSmarted.com See omnystudio.com/listener for privacy information. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.