Answer:
For example, if you are missing one senator, then you would have an even number, which means you can't make a decision if 4 people agree on one side and the other 4 agree on something else.
Explanation:
1: Treaty of Paris
2. Cuban Rebellion
3. USS Maine Sinks
4. De Lome Letter
5. U.S declares war on Spain
6. U.S lands on Cuba
:D
The change in the frequency of an existing gene allele