I’m pretty sure it’s physical systems
The correct answer to this open question is the following.
The Indus River Valley Civilization was isolated from the outside world due to the geographic features in which it was located. Basically, next to the Indus River. They were known as the Harappa civilization and settled in modern-day Pakistan. The two most important cities of the Indus Valley were Harappa and Mohenjo-Daro.
Historians think that two factors influenced the disappearing of the Indus Valley civilization. One is climate change. The other, the ib¿nvasion of a tribe called the Aryans, an Indo European tribe who were nomads. The decline of this civilization started in 1800 BCE.
It was believed that even numbers are unlucky.
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Explanation: </u>
It is an old superstitious belief that even numbers are unlucky. In respect of the same superstition, a gun salute is set off odd numbers.
It is a gesture of bestowing great honor on a significant individual. Since long back in history, symbolism has been denoted to every numerical known. Hence, firing a gun for a certain of an odd number of times symbolizes varied kinds of respect in every country.
Some countries fire shots 21 times because number seven is sacred and lucky. Hence 
Answer:
Explanation:
Based on the information provided within the question it can be said that these rulings severely hurt the status of African American's pursuit of civil rights because they ended up limiting the federal government's ability to be able to protect those rights because the courts ruled that the legal rights were only associated with federal citizenship, not those that pertain to state citizenship.
