Hello,

It totally depends on your choice and interest.
Since you have studied computer science, you can pursue BCA (Bachelor's in computer application).
If you are interested in Biology then you can go for B.Sc in Botany, Zoology, Microbiology, Biochemistry, Bioinformatics and so on.
There are many options, you should think and decide which interests you more and then select one.

I hope this helps.