Compare and contrast the size and function of the upper and lower extremities of the appendicular skeleton.

Lower limbs are larger in size as compared to upper limbs.

Explanation:

The size of the upper and lower extremities of the appendicular skeleton is different from one another due to their difference in size. Lower limbs are larger in size as compared to upper limbs due to their difference in functions. The function of the upper and lower extremities of the appendicular skeleton also different from one another. The function of upper limbs to grasp and manipulate objects while on the other hand, the lower limbs allows the person in locomotion.

currents is the correct answer.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.