While you can find many online courses and even some online Master's degrees in biology, it's
very rare to find a fully accredited, reputable Bachelor of Science (BS) degree in biology offered entirely online. The hands-on laboratory work required for a biology degree is a significant hurdle to overcome in a purely online format. Many programs may offer some online components, but they almost always require in-person lab work and potentially other on-campus requirements.
Before enrolling in any online program claiming to offer a BS in Biology, thoroughly research the institution's accreditation and the program's specifics. Look for details about required on-campus activities or lab components. A fully online BS in Biology should raise significant red flags regarding its legitimacy and the quality of the education.