The correct answer is option C and D - The study of ecology and The study of genetics
The central theme is a characteristics features which is common in all the living forms varying from Amoeba to whale and these themes are also known as “unifying characteristics” which distinguishes living being from the non living things. Considering this the major themes of biology are as given below -
a) Cell, its structure and functions
b) The relationship between different organisms/species
c) Hoemostatis and stability
d) Reproduction and genetic variation
e) Evolution of organisms.