Amyelin sheath is

a. large band of neural fibers connecting the two hemispheres of the brain.
b. fatty tissue layer encasing the axon of a nerve cell.
c. bushy extension of a neuron that conducts impulses toward the cell body.
d. nerve network within the brainstem that controls physical arousal.

B. Fatty tissue layer encasing the axon of a nerve cell

Explanation: Myelin is an insulating layer that forms around a nerves including those of brain and spinal cord,its is made up if protein and fatty substances.The myelin sheath aids in the quick and efficient transfer of electrical impulses along a nerve cells. Damage to it can slow down the impulse,for example multiple sclerosis diseases.

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.