(Sample link) National Geographic for Kids http://www.nationalgeographic.com/kids
Excellent Link for viewing cells http://cellsalive.com/
Another excellent cell link http://www.kn.sbc.com/wired/fil/pages/huntanimaloja.html#questions
check out this site for animal cells http://vilenski.org/science/safari/animals/index.html
A link discussing viruses http://www.ucmp.berkeley.edu/alllife/virus.html
An excellent resource for studying crayfish anatomy http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html
A cool link with cell quizzes and interactive games. http://www.execulink.com/~ekimmel/target_practice_quiz.htm
mitosis link