<p>So my school uses Biology 4th edition. I’m going to be doing USABO this year so I was wondering how much of a difference is there between the 4th and 7th editions. Is it a big enough difference that I should buy the 7th edition?</p>
<p>So my school uses Biology 4th edition. I’m going to be doing USABO this year so I was wondering how much of a difference is there between the 4th and 7th editions. Is it a big enough difference that I should buy the 7th edition?</p>