Example of unity paragraph?

Unity in a paragraph is making sure that everything "flows." The paragraph should always begin with a topic sentence, such as "One of the reasons the climate is changing is because of pollution." From then on, whatever is being said must support the topic sentence. If you make claims, they need to be supported by logic. An example of a paragraph that would not be unified would be by inserting a random fact about your dog in a paragraph about global warming. They're not related, nor does your dog have an relevance to global warming.