is it okay to do both economics and biology together at diploma of secondary education?

because normally biology goes with chemistry? I don't understand.

I have been troubled with selecting economics or biology for years, but I think it's way better for me to take both, as economics is my strength and I like biology too.

here's a hint: I seldom/rarely mention anything about chemistry, I just do it because I have to. But for economics, I fall in love with it. economics and I couldn't be apart. I could swap chemistry to economics in the next starting year. Sounds good? (Or remain unchanged? not much of a difference, really.)