To be completely honest with you, that is a pretty poorly written paper. There is almost no structure to it whatsoever. I saw no hooker, thesis statement, topic sentences, or citations in your paper.
It looks like you just typed a mass of text and threw paragraphs into it. All you did was type a chronological run-down on Crick's life. This is shows poor planning and structure to your paper, and is pretty boring to read. What you should do instead is have your first paragraph give the reader a brief overview of what you are going to talk about in your paper. Then I would divide the paper into paragraphs discussing his early years, achievements, and effects of his work. One good thing I saw was your conclusion paragraph. It was well written and had a good cliff hanger.
You might also want to consider revising your grammar in some of your sentences. You use waaay too many parenthesis, and you only need to spell out DNA once.
Instead of saying "He was born to parents that did not have much wealth. The lack of wealth is due to both of his parents working as shoemakers in Northampton. Francis Crick received his early education in Northampton, England (where he was born), and London," you might want to revise it to "Born into a lower class family of shoemakers, Francis Crick revieved his early education in the cities of Northampton and London."
I'm not trying to be mean, but when school is on the line, you gotta be tough.