This site has a little bit of everything. They cover almost every topic for biology that you can think of. The best thing about it that each topic – like each organelle of a cell – is pretty much contained on one page. So if you want to talk about only certain organelles, you can just use those pages. And each page starts off simple and gets more complicated as you read down. So you can stop wherever you want to. While it likes the animations I love, I still like the site for its simplicity. The kids seemed to like it. Maybe because some of the drawings look like a kid did them? I’m not sure. They also have quizzes you can take online.
Rader’s Biology 4 Kids