In the context of group size witch of the following in a phenomenon in which working in the presence of others increases effort or productivity?

well since twins have about the same dna they dont have one think in common which is the figer print. nobodys fingerprint is the same. if your using twin you would most likely get around the same results for both of them because of the genetics.. i hope this

the use of electrical signals that transit messages is know as

earthquake fault lines