In a barter system, a baker is most likely to

Barter means exchange since there was no currency back then so in order for a baker to produce bread again he will need wheat again from the farmer so i would say the answer is trade bread for wheat . Hope this helps

Exchange (goods or services) for other goods or services without using money.

a is your answer

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genetics is the study of how dna works, the methodologies defining the new recent technologies allow scientist to have a panoramic view of the entire dna landscape, especially how genomes interact with their environment, including off course, factors outside their organisms.

thus is very possible the existence of both scenarios, where populations of isolated individuals have different genetic traits, and share traits related to genetic mutation, due rats can easily travel overseas using human transport channels. so scientists could get a vast number of data, including human interaction, evolution of rodents, health development, spread of infections, development of new organisms, how genomes evolve in different environments and so on.