Question

long bone
cavity
ow
b
d articular cartilage
a
spongy bone
e
f
g
h
medullary cavity
c diaphysis
i

Explanation:

The diagram is of a long bone, which is related to the study of the human body's structure, falling under Biology (a subfield of Natural Science). Biology deals with the anatomy and physiology of living organisms, and this bone structure analysis is part of biological studies, specifically in the area of human anatomy.

Answer:

Natural Science - Biology (as the diagram is of a long bone, related to biological study of anatomy)