The law that the properties of the elements are periodic functions of their atomic numbers
The only true option from the list would be that "<span>In time a fifth group was added to the caste system--the untouchables," since this was a later development and not an initial part of the system. </span>
Answer:
The last one
Explanation:
She was instrumental in the Lewis & Clark Expedition as a guide as they explored the western lands of the United States. Her presence as a woman helped dispel notions to the Native tribes that they were coming to conquer and confirmed the peacefulness of their mission.
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