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AveGali [126]
3 years ago
15

It is important to protect air quality because of what

Biology
1 answer:
Ber [7]3 years ago
3 0
It is an indicator of poor air quality from air pollution. This pollution is most often ozone or particulates. Typically it indicates that the air is unhealthy for children, the elderly, and sensitive groups.
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The force that one surface exerts on another when two rub against each other ia called
dybincka [34]
<span>Balanced forces acting on an object do not change the object's motion. The force that one surface exerts on another when the two rub against each other is called __. The force that one surface exerts on another when the two rub against each other is called friction.</span>
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3 years ago
Which of the following is considered a secondary source?
tatiyna
Since a secondary source is a source written after an event has occurred, I want to say that the answer is A. Hope this helped!<span />
5 0
3 years ago
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an animal carcass had 24 grams of carbon 14 when it was alive and 3 grams when its fossilized remains were discovered how old is
KengaRu [80]
The carbon 14 left from this animal is 3 grams of 24 grams which is: 3g/24g= 1/8 times of its original mass. Then, the age of the animal fossil would be:

final weight= initial weight * (1/2) ^ time/half-live
1/8 initial weight = initial weight  * (1/2) ^ time/half-live
log2 1/8= log2 (1/2) ^ time/half-live
-3= -time/half-live
time= -3 * -(half-live)
time= 3 half-live

If the half-live is 5730 years, the age would be: 3* 5730= 17.190 years.
3 0
3 years ago
Which of the following describes a state of equilibrium?
Lelechka [254]

Answer:

<h3>When water molecules have stopped moving or vibrating . </h3>

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3 0
2 years ago
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The Precambrian time period is the largest on the geological time scale. Please select the best answer from the choices provided
Sedaia [141]

Answer:

True

Explanation:

Precambrian, period of time extending from about 4.6 billion years ago (the point at which Earth began to form) to the beginning of the Cambrian Period, 541 million years ago. ... The Precambrian represents more than 80 percent of the total geologic record.

3 0
3 years ago
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