The internal feature of bone that makes it simultaneously strong and lightweight is the

The correct answer is the orientation of trabeculae in the spongy bone.  

In the long bones like the femur, at the terminals, the bone is not solid but it comprises holes, which are associated with each other by thin rods and plates of bone tissue called trabeculae.  

This kind of porous or spongy bone is called cancellous bone and is observed at the terminals of the long bones like the femur, and also in the ribs, pelvic bones, vertebrae in the spinal column, and the skull.  

Though cancellous bone comprises a lot of holes in it, it is strong and robust. Each time an individual run, jump, or walk, he or she implies mechanical stresses on the bone in the spine, hips, and pelvis, and they don't break. This strength and support are given by the trabeculae. It gives both strength and also lightweight to the bone due to its porous nature.  

you are certainly talking about this picture:

a: is the label of the white square, it is showing the  replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication 

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes  the dna with the dna template and increases  the processivity of the enzyme. ==>   stops polymerase from falling off the  template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built  in the opposite sense of the helicase, so dna will be built in fragments ==> built  fragments from 5' to 3 joins

and finally f: is the enzyme that builds  the new dna strand (dna polymerase) ==>   adds nucleotides to make a new dna helix.

credit: gradman555p98x9p

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i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .