Biology studies life. Although you may think a biologists work is all about growing plants and observing animals, the core of this discipline is more focused on much smaller structures: cells and genes.
To do that, you need new technologies and complicated devices. Yet no matter the size of the examined object, biologists strive to answer one question with their work: how does it work? That way, biologists look more like engineers, as they try to explain the functioning of complex mechanisms, by dividing it into simple processes. Their research subjects though, are living organisms. Why then is it good to study biology? First of all, so that we can understand ourselves better - after all, we are all living things!