Why part of the spine bends and part of it does not?

What are the components of an effective weight-training program? a. conditioning, progression, generalization, overwork, balance, and recovery b. overload, progression, specificity, regularity, recovery, balance, and variety c. overwork, coordination, motivation, conditioning, regularity, and variety d. consistency, progression, rest, regression, balance, and specificity

Does indrect sunlight does not pose any danger to the skin

The load is the pivot point of a lever.