need help with activity 7 and 8

I can help out just let me know what exercise this is from

Activity 7:  Testing the Effects of Lidocaine

1.   Does this generate a trace? No
2.   What sort of tracing is seen at the threshold voltage? The screen displays a flat line.
3.   Why does Lidocaine have this effect on nerve fiber transmission? Lidocaine is a sodium ion channel antagonist, which will block sodium channels from opening, inhibiting any action potential from being generated.

Nerve Conduction Velocity
Activity 8:  Measuring Nerve Conduction Velocity

1.   Which nerve in the group has the slowest conduction velocity? Earthworm
2.   What was the speed of the nerve? 8.85 m/sec
3.   Which nerve of the four has the fastest conduction velocity? Rat Nerve 2
4.   What was the speed of the nerve? 46.74 m/sec
5.   What is the relationship between nerve size and conduction velocity?  What are the physiological reasons for this relationship? The larger the nerve, the faster the conduction elocity. Conduction velocity is faster if the nerve is myelinated than if it is not.
6.   Based on the results, what is your conclusion regarding the effects of myelination on conduction velocity?  What are the physiological reasons for your conclusion? In myelinated nerves, conduction velocity is faster as the action potential jumps from node of Ranvier (internode) to node of Ranvier and does not travel along the cell membrane.
7.   What are the evolutionary advantages achieved by the myelination of neurons?  Attack and escape. Myelinated neurons allow faster reflexes increasing chance of survival, which allows you to pass your genes on to your offspring.

Hope this helps