Answer:
A.
Explanation:
Most animal exchanges came from the Old World to the New World.
Census is the complete count of a population, including place of residence.
The weapon that helped continue the stalemate on battlefields during World War I is option<em> D. Machine Gun</em>. A stalemate is a situation in which neither side has a clear victory over the other. The war becomes very long and slow, and armies have to be creative to surprise the enemy. There were many stalemates in WWI, especially in the Western Front.
