B. It was a challenge to decide how to divide forces and protect two coasts.
The Underground Railroad is not a railroad that is underground, instead, it is referring to a secret passage for slave escaping in safe houses. The conductor of the Underground Railroad could be the person who helps the slave escape, the lines could refer to the road or the passage which the slaves escaped from one safe house to another, the station could refer to the stops they make in the safe houses, and the freight may refer to the slaves that are escaping.
Answer: Homo Erectus
Explanation:
Homo Erectus developed into Homo Sapiens.
<span>1. Archduke Franz Ferdinand is assassinated in Sarajevo.
2. </span><span>Russia mobilizes its vast army to intervene against Austria-Hungary in favor of its ally, Serbia. This move starts a chain reaction that leads to the mobilization of the rest of the European Great Powers, and inevitably to the outbreak of hostilities.
3. </span><span>Germany invades Belgium, beginning World War I.
4. </span><span>A German submarine sinks the passenger liner </span>Lusitania<span>. The ship carries 1,198 people, 128 of them Americans.
5. </span><span>The British employ the first tanks ever used in battle, at Delville Wood. Although they are useful at breaking through barbed wire and clearing a path for the infantry, tanks are still primitive and they fail to be the decisive weapon, as their designers thought they would be.
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