The answers to the questions are exposed when visitors roll their cursor over the answer boxes. The site provides background information for each activity as well as suggestions for set up, materials, and procedures. It offers alternate exercises if the sea urchins do not release their gametes or if fertilization does not occur. Recipes for gamete dilutions are provided to prevent problems such as more than one sperm fertilizing the egg or a sperm count too low for successful fertilization. Animations and time lapse videos illustrate laboratory procedures, developmental stages, and the results of gamete dilution problems.
Visitors can find detailed still photographs of the experimental procedures.
Animations and illustrations are downloadable from the site. Specially designed pages are provided for teachers to use as overhead transparencies. Visitors can access web sites to order materials and find educational resources through this site's links. Netscape 4.0 or above required to view some materials. This site is available on CD-ROM or as a ZIP file for downloading.