Amir suffered a severe brain injury in a motorcycle accident and was partially paralyzed on the left side of his body. after several months of intensive physical therapy, he gradually regained the use of his left leg and arm. this example best illustrates the principle of:

  Plasticity

Plasticity or brain  (neural)  plasticity applies to injury. When we are injured, we use some movement patterns of our legs and arm to avoid strain on damaged tissues and to keep us going. But gradually, we are back to our original movement.

Amir gradually regained the use of his leg and arm due to the principle of plasticity (the capability of the central nervous system to let us adopt from its functional and structural organization to our current requirements). 

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."

videntify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.