Trilobites were rapidly evolving and widespread marine organisms that spanned a number of geologic time periods. Certain types of trilobites only appeared in specific segments of geologic time; therefore, when one of these trilobites is found, you can be certain that the rock layer it is found in is of a certain geologic age.
put the following events in order:
1. George Washington elected as president
2. Bill of rights
3. Louisiana purchase
4. Lewis and Clark expedition
5. Treaty of Guadalupe Hidalgo
explanation:
•George Washington was elected president in 1789.
•the bill of rights was written in 1791
•The Louisiana purchase happened in 1803
•The Lewis and Clark expedition started in 1804
•The treaty of Guadalupe Hidalgo was signed in 1848
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D. The United States Constitution, it holds the basic laws of our nation, "land"
