Answer: structural adaptation
An adaptation is a change or the process of changes that occur in an organism or species which allows an organism or species to become better suited for the environment. The adaptation in an organism can be in the form of structure, physiological, and behavioral.
Camel hump is a structural adaptation, camels are adapted a hump which allows them to survive in harsh desert environment where water and food availability is nearly negligible. The hump actually stores large amount of fat, which they can metabolize in scarcity of food and water.