Which theme of biology explains the modification of an organism's parts to adapt to its habitat?

A. Interdependence in nature

B. Relationship of structure to function

C. Continuity and change

Inter means between, so interdependence is dependence between things. We often use interdependence to describe complex systems.

Interdependence in nature explains the modification of an organism’s parts to adapt to its habitat.

Hence,

Best answer is:

A. Interdependence in nature