When choosing livestock, it was important for travelers to consider a.
if the animals had made the journey before, how fast the animals could travel, and whether the animals knew the way.
b.
if the animals could swim up the rivers and whether the travel would include muddy or sandy roads.
c.
if travel included sandy or muddy roads, how much the animals would cost, and how fast the animals could travel.
d.
if animals could survive the desert heat and how much the animals would cost.

C-if travel included sandy or muddy roads, how much the animals would cost, and how fast the animals could travel.

Explanation:

I took the quiz and this is the correct Answer.

C. if travel included sandy or muddy roads, how much the animals would cost, and how fast the animals could travel.

Explanation:

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.