The potential must be strong enough to send a(n) potential to the cns.

It is true that the potential must be strong enough to send a potential to the CNS. The stronger the potential, the more it will excite the transmitter in relaying the message to another neuron, therefore, if this happens, the more will it be easier to pass the message.

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

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.