Answer:
3
Explanation:
commensalism is the third one
The cup like structure, in which the femur fits into the hip bone is known as Acetabulum.
the acetabulum is referred to a concave shapoed surface of the pelvis, which have a cup like groove. This groove helps in the binding of the femur head to the hip or the pelvic bone.
The round head of the femur gets fits into this cup shaped structure and forms the hip joint. The acetabulum is formed by the contribution of ischium, ilium and the pubis.
A difference in air pressure and temperature occurs. While weather conditions CAN affect air mass movement, a mixture of cold and warm air masses (which have differences in air pressure and temp) cause jet streams and more directly affect the movement of air masses. As a cold air mass builds, the temperature gradient between the cold air mass and the warmer air outside the air mass will increase. This increases the upper level winds which in turn helps steer an air mass away from its source region.
