Physics! Especially the bits that are very close to chemistry, and quantum mechanics. When things get really small, the world is a very different place, and all sorts of weird effects happen. (Also I didn’t do very well in my Physics A level, but that might have been more to do with laziness!)
I find genetics quite difficult to understand because its really complex and I sometimes find it a little bit difficult to understand things if I can’t imagine them or visualise them… DNA is too small to visualise!
I also found chemistry really hard when I was at school.
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