There were two things Texas agreed to so it can be the 28th state. These two things were... O Texas would keep its public land, and the United States would pay Texas' debt.
Texas must lose its public land and had to keep its debt.
O Texas would keep its public land, but the United States would not pay Texas' debt.
O Texas must lose its public land, but the United States would pay Texas' debt.

its the last one you have listed

Explanation:

U.S. most likely wanted something in return for paying the debt, so im guessing that the U.S. wanted Texas' land

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.