Can I study Biology without having it as a main subject in PUC? I am interested in fields like Zoology, Wildlife, Paleontology and genetics

i am studying bca but my interest lies in the field of biology but i didn't studied biology in my puc so is there any chance for me to quit computers and follow my dreams in the field of biology do i have to take up any course since i dont have biology background my interest lies in the fields such as zoology,wildlife,palentology and genetics.is there any chance for me to study any one of these courses.