2 courses in one science

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So I need 3+ courses in one science which I am fine with (biology) and 2 courses in another science. I was first going with chemistry and doing Chem 101 with SDC and then Chem 111L with Lab. I am not sure I want to do a second lab when I don't need to.

I have already done intro to environmental science, would earth science come under the same subject, or are they different? Would there be some overlap?

I'm looking at SDC & Coopersmith