The introduction to a scientific explanation is very important. The introductory sentence or paragraph must clearly state the claim and tell the reader the purpose of the text. Stating a clear purpose will help the reader better comprehend your explanation.

The evidence and reasoning make up the body of your scientific explanation and support your claim.

Evidence includes relevant facts, data, examples, research findings and quotes from experts that support the claim. You must use logical reasoning to explain why the evidence supports the claim.

Organize the evidence and reasoning in a way that makes it easy for the reader to understand. For example, keep related pieces of evidence together, and provide reasoning after you have given sufficient evidence.

As you write your scientific explanation, use transition words to connect the evidence and reasoning to the claim. Words such as “because,” “therefore,” “for example,” “reason” and “as a result” might be helpful in connecting ideas.

Words such as “in addition,” “furthermore,” “at the same time,” “in conclusion” and “finally” may be helpful in transitioning between different ideas or paragraphs of the text.

As you develop your scientific explanation, be sure to include domain-specific vocabulary. Including vocabulary that is related to the topic will make your explanation more clear and precise.

Use a formal writing style to help ensure that your scientific explanation is clear and accurate. Your explanation should be unbiased, or neutral -- it should not just support one side of an issue. An unbiased explanation will help the reader focus on making sense of the topic.

After you have developed the body of your scientific explanation, write a conclusion that restates or reinforces the importance of your claim. A sound conclusion brings it all together for the reader and increases understanding of your explanation.