One group of reptiles, characterized by the fossil Archaeopteryx, led to the evolution of birds. The correct answer is birds
There are a lot of effects that could happen to the function of the neurons when the neuro toxin have conducted the change. Would be unable to generate action potentials are the axons. Also the axon potentials would have a shortage in repolarization phase. So it can actually be shorter than usual.
D. Bar graph
Here is a discussion