The word that is different from the rest is Appendix because it is the only word that does not belong to the skeletal system. Here's a detailed explanation:
Skeletal System:
- The skeletal system is composed of bones and provides support, shape, and protection to the body.
- It also helps in movement, production of blood cells, and storage of minerals.
Now let's analyze each word:
A: Skull
- The skull is a bone structure that protects the brain and forms the framework of the face.
- It is a part of the skeletal system and consists of several bones fused together.
B: Appendix
- The appendix is a small, finger-like organ located at the junction of the small and large intestines.
- It is not a part of the skeletal system and has a different function in the digestive system.
C: Pelvis
- The pelvis is a basin-shaped structure at the lower end of the vertebral column.
- It consists of several bones, including the hip bones, sacrum, and coccyx.
- The pelvis is a part of the skeletal system and provides support for the abdominal organs.
D: Fibula
- The fibula is a long, slender bone located on the outside of the lower leg.
- It is one of the two bones in the lower leg, the other being the tibia.
- The fibula is a part of the skeletal system and helps in providing support and stability to the leg.
In conclusion, the word "Appendix" is different from the rest because it is an organ in the digestive system and not a bone in the skeletal system.