Click on links of interest below:
Oceonagraphy with Lab: This is based on 180 days. A complete free online curriculum.
Sea Turtle Unit Study
Christian Biologists
Sand Dollar Unit Study
With anything online please be aware that most content is not written with a Christian perspective in mind. So be aware of terms related to evolution, global warming, animal activism, enviromental activism, and so on so forth. Learn what is good and and what are facts and put the other stuff in the garbage.