Accomplishing all the tasks such as exams, reports and experiments you have to conduct in your biology program are hard enough but the last hurdle between you and your official status as a qualified biologist is your biology dissertation. Basically biology is a study of the life science of various organisms. Now you have to choose a topic for your biology dissertation depending on your field of specialization. If you have majored in microbiology then you could choose a topic for your biology dissertation as "The Role of Heredity in Molecules". If you have specialized in zoology then you can write your biology dissertation on the topic of "The Effect of the Constant Transformation of Mangroves on Fish Reproduction Cycle".
If you happened to have specialized in botany, a good topic selection for your biology dissertation could be "The Effects of Global Warming on the Natural Habitat". There are many topics you can write your biology dissertation on, like "How Sea Life Can Be Helped to Recover from the after Effects of Oil Spills" in the case that you have specialized in marine biology.
You have to choose a topic for your biology dissertation based on your specialized field. You must have an interest and aptitude for specializing in a certain field of biology. Dissertations have to be written on a topic you are motivated to write innovative, ground breaking or evolutionary theories that you are able to support through your findings from your studies, experiments, interviews, surveys and even experience. For instance you can write a biology dissertation on "The Constant Evolution of Living Species and the Possible Consequences In The Future".