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.
*Cellular adaptation is a reversible, structural, or functional response both to normal or physiologic conditions & to adverse or pathologic conditions. 1.) Atrophy: decrease or shrinkage in cell size. Most common in skeletal, heart, secondary sex organs & brain.