What are two factors that keep bones healthy?

factors of bone health:  

Calcium and Magnesium intake (building blocks for bone)  

Vitamin D intake (regulates the amount of Calcium in the blood and in bone)  

Calcium and vitamin D work together to protect your bones—calciumhelps build and maintain bones, while vitamin D helps your body effectively absorbcalcium.

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion