A Biology paper can be very hard for students to complete. Biology is a tremendously wide field with a vast range of possible topics to write on. Fortunately, the student has two things on his side: Biology tends to be an easier field to write on than, say, physics, and there are many sources available for writing a Biology research paper.
Yes, you will need sources. You can't use thoughts or feelings in a Biology paper. You'll need a scientific hypothesis or question to answer, and you'll need to support your answer with citations from journal articles, experiments, and Biology texts.
So, how do you choose what to write on? Start out by looking at what you find interesting. Choosing a topic to please your professor or teacher can be a false economy, because it will show if you find a topic boring. On the other hand, a subject that's fascinating to you will also be faster and easier for you to write about... and the enthusiasm will be shown in the final work.
Consider the experiments you did in class as one source of ideas. You can also look at more general topics of Biology, from basics like mitosis to cell division and even more abstract themes like Darwin's theories of evolution.
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Similar principles apply for a Geology paper. Whereas in Biology you may have the results of experiments you did as sources to draw on, Geology paper tends to be much more literature-research oriented. Get ready to crack the books! Geology essays might cover anything from coastal erosion to moon expedition results.
Don't forget the social implications. Major geologic changes can make for sweeping shifts in the lives of the people and animals living on top of them. Consider what it might have meant for the inhabitants of the continents as they broke apart, or how the surrounding ecosystem changed when a volcano erupted.
Of course, if you need help with a Biology or a Geology research paper, an academic assistance writing agency will be happy to help you.