Choose any biology topics to write about.

1) clear sense of order. begins with a thesis or topic sentence. supporting points are presented in a logical progression.
2) the essay has a single central point that is discussed from the introduction through to the conclusion. the point is supported and developed by factual evidence that has been carefully thought through.
3) all sentences are well constructed and have varied structure and length. the author makes no errors in grammar, mechanics and/or spelling.