Here are five examples of things that do not need to be documented or cited:
1. Your own ideas or original findings
2. Historical facts that are validated by multiple sources
3. General observations such as 'A lot of people spend their time on their phones.'
4. Common sayings such as 'Honesty is the best policy'
5. Social customs and traditions
Otherwise, it is necessary to cite your reference in order to give credit to the one who came up with the idea you are referring to.
Answer:
Large Aryan groups migrated to East India due to the very fertile farmland and rich soils good for the production of crops
Explanation:
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He should have multiple bottles of different types of lake water or stream water , run them through the water filter and then test each result with pH paper, as pH paper will tell if it's safe or not safe to drink
Tribal Marks
In many cultures in Africa, tribal marks are very common