I would hope that everyone here believes that microorganisms evolve or else we would only have to get the flu shot once in our lives. Earlier posters were clearly not talking about those aspects of evolution. In theory, I don’t have a problem with the bio classes either, but in practice you can’t assume science teachers never have an agenda.
It’s assur to learn about the practices of idolaters. Past that, I think you can listen to and be tested on subjects that are contrary to the Torah. Nobody said you have to believe them.