The answer is D.
Species diversity has been increasing through decades of years.
The answer to this question would be: vertebrae
In vertebrae fracture, traction is important to assure immobilization of the vertebrae. Movement can cause the fragment of bone in the fracture damaging the neural tissue in the vertebrae.
To ensure no movement in the neck, metal tongs can be put on the skull. The tongs will help fixate the skull with the shoulder.
Points c and d would have spring tides.
Striated Muscles. Cardiac muscles are in your heart, cartilage is flexible connective tissue found in various forms in the larynx and respiratory tract. Organs are things like your heart, stomach, liver, etc.
