There’s a lot more to biology than medical.
Agronomy, sustainability and all the conservation disciplines, marine life, food supply innovation. All the “population level” health careers-- biostatistics, epidemiology, etc. Tons of policy type roles relating to water, habitat, recycling and its pitfalls (does the ink from commercially produced packaging end up in the human body in some way and if so, how?) etc.
I agree with the advice not to worry too much about an actual major. There are people doing cool things with their degrees that weren’t even on their radar when they went to college and certainly not HS.
I think finding a college where you don’t have to show up on day 1 aligned with a department and a particular degree is important for an undecided kid. I think finding a college where switching isn’t a hassle is important. I think finding a college where exploration is “the thing” freshman and sophomore year is important.
The rest will work itself out. Your kid will take an intro to Anthropology class (for example) and realize that developing models of what early humans looked like is the true calling (a discipline relying on bio, genetics, art/design, history, etc.) and then it’s off to the races. Or will take an agronomy class and then join a professor’s team developing a new soybean seed which uses less water and no pesticides and you’ll watch proudly as they re-engineer the diet and habitat of billions of people on earth!!!