Answer:
The Answer is Australopithecus afarensis
Explanation:
The presences of myelin allows an axon to conduct their signals rapidly
The answer for your question is b and c.
Hope this helps:)
Axons with large diameters conduct impulse faster than those with small diameters. Also Myelinated axons conduct impulse faster than unmyelinated axons. Axons with the largest diameter are all myelinated, therefore they are capable of salatory conduction (Impulses jump from one myelinated node to another). The smallest diameter axons are unmyelinated, so their conduction is continuous.
I hope this helps. :) :)
