ACCEPTABLE REASONS TO USE SICK LEAVE. You can use sick leave when: 1  You have a mental or physical illness, injury, or health condition; you need to get a medical diagnosis, care, or treatment of your mental or physical illness, injury, or condition; you need to get preventive medical care.
A structural adaptation is when an animal or a living thing is adapted to its environment by the way its body is built or shaped.Structural adaptations involve physical traits that can help an organism to survive in its environment.ehavioural adaptations are different from structural adaptations, and mean the way that an organism behaves which helps it to survive in its environment.
The term structural system or structural frame in structural engineering refers to load-resisting sub-system of a structure. The structural system transfers loads through interconnected structural components or members. Commonly used structures can be classified into five major categories, depending on the type of primary stress that may arise in the members of the structures under major design loads.