In the feudal system, what was a manor? A. a lord's estate
B. a right to use land
C. a customary way of doing things
D. an obligation to provide protection

B

In general, Manorialism was a system of landholding common in Medieval Europe in which a feudal lord lived in and operated a country home (manor) with attached farm land, woodlands and villages. ... The feudal lord of the manor made wealth by collecting taxes and fees from the peasants on his feudal land.

norsemen from northern countries had made earlier journeys

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.