Answer:
Overgrazing by livestock is leading to significant environmental degradation—Grevy's zebras compete with the ever-increasing livestock population and agricultural crops for water.
Explanation:
The practice of paying back money to large companies who funded the railroad (assuming you meant railroad).
Answer:
(A) Relocated
Explanation:
You didn't include the sentence that was meant to be shown but based on the connotation and definition of the word 'migrated', the answer is most likely relocated.
Hope this helps :)
Answer: B. were not completely unified
Trees and fish, these were the two most important.