And let me tell you, the difference between Cs and As as an undergrad is the difference between getting a job in the industry and getting a job making $200k or more at FAANG straight out of college, that will put you in touch with the smart and/or moneyed people who are going to make you a multimillionaire. And you want to be a multimillionaire because this is the USA and that is the only path to being able to afford the medical care you may very well need especially in later life.

Graduate programs are also GPA-gated. So best get those grades up if you want your license to science (i.e., a Ph.D.).