Lower level Marine Biology curriculum?

I’ve posted about this when I asked for help with math but due to health issues and low grades, my husband and I have pulled our daughter out of public school. (She’s an incoming 9th grader)  She’s not too happy about starting homeschool because like any teenager, she wants to see her friends everyday.  To help her, I thought it would be nice for her to pick some of her subjects.  I specified which subjects she needs to take but said that she could pick the actual area’s of study in a couple of subjects.  In Science she asked to study Marine Biology(Ocean ography?) and Astronomy.  The thing is, her grades were so poor last year that I want to have her science curriculum this year be at about an 8th grade level.

But I can’t seem to find a lower level Marine Biology.  I asked her a few questions about what she wanted to study in particular about Marine life/oceanography and she said she wanted to learn about the ocean, and the animals who live there.  The Marine Biology curriculums that I’ve found require you to take Biology or some such other class first, but DD only had a short until in Biology last year, and she got a poor grade in the class overall I don’t feel comfortable ordering Apologia’s Marine Biology curriculum this year.  I don’t think she’s at that level yet.

Also, does anyone have any living book suggestions for Astronomy or Marine Biology?

And I just realized I didn’t specify that I wanted this in the Science section, if a mod wants to move it there, that’s fine.