Respuesta :

The four branches of biological science are:

1. Ichthyology 
2. Etymology 
3. Ornithology 
4. Mammalogy

I hope this helps!
the answer would be 1,etymology, 2,  Ichthyology, 3,  Mammalogy, and 4, Ornithology 
Hope that this all would help you! =)
!
=)