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A river valley civilization is an agricultural nation or civilization situated beside and drawing sustenance from a river. A "civilization" means a society with large permanent settlements featuring urban development, social satisfaction, specialization of labor, centralized organization, and written or other formal means of communication. A river gives the inhabitants a reliable source of water for drinking and agriculture. Additional benefits include fishing, fertile soil due to annual flooding, and ease of transportation. The first great civilizations, such as those in Mesopotamia, Harappa and Ancient Egypt, all grew up in river valleys. Tigris River flourished near Mesopotamia civilization and river nile flourished near civilization of Egypt.
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Answer:
To separate salt, sawdust, and iron, use a magnet to separate the iron. Then, add water to dissolve the salt and float the sawdust. Skim off, sieve, or filter the solution to separate the sawdust.
Scientific ideas don't need to be published in an encyclopedia: rather, they need to be published in a peer-reviewed journal.
Also, public acceptance is not relevant: global warming is accepted in the scientific community despite a lack of popular acceptance.
The correct answer is: They are new ideas. (and once they're accepted they can become laws).
Answer: D.) They study the stars and gases around black holes.
Explanation: Given the technology that we have in the 21st century (as of 2020), scientists cannot study black holes directly, and must resort to observing and detecting how the presence of them exists by noting how they take an effect on the matter surrounding them.
Animal cells<span> do not have a </span>cell<span> wall or chloroplasts but </span>plant cells<span> do. </span>Plant and animal cells<span> are both eukaryotic </span>cells<span>, so they have several features in common, such as the presence of a </span>cell <span>membrane, and </span>cell<span> organelles, like the nucleus, mitochondria and endoplasmic reticulum.</span>
