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andreyandreev [35.5K]
3 years ago
7

How and why has the air quality changed in the United States over the last 30 years?

Biology
1 answer:
Mars2501 [29]3 years ago
6 0

Answer:

It has gotten worse.

Explanation:

In the past 30 years, air quality in the United States has declined almost exponentially. Pollution is the main reason for the declination of air quality in the United States, but there are different kinds of pollution, including light pollution, noise pollution, air pollution, water pollution, etc. Air pollution can be caused by primary or secondary pollutants. Primary pollutants include carbon, nitrogen, and sulfur oxides as well as just general particles in the air. Secondary pollutants are formed when pollutants are exposed to sunlight via chemical reactions.

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Some seeds contain fluffy parachute like structure why​
seropon [69]

Answer:

Usually, the larger the seed, the more food reserves it contains. ... For example, Dandelion seeds have developed very light and fluffy parachute-like structures. These help the seeds to float in the wind and delays their fall to the ground. This delay allows the seeds to be carried further.

3 0
2 years ago
The most plausible hypothesis to explain why species richness is higher in tropical than in temperate regions is that
qwelly [4]
The most plausible hypothesis is: Tropical regions generally have more available water and higher levels of solar radiation. They also have very high rates of immigration and very low rates of extinction.

explanation:
Water is essential for an abundance of life, and sunlight is the means by which the whole food chain receives energy. Plants convert the sunlight into food, herbivores eat them, and other animals eat herbivores.

Hope this helps, and muchas luck on your biology.
7 0
3 years ago
Can someone please help me?
oee [108]
Hitherei thinkthe answeris1
4 0
3 years ago
Read 2 more answers
Which type of solution is ideal for carrying out cell functions in the body?
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3 0
2 years ago
In his study of the Mediterranean fruit flies (Ceratitis capitata), Matthew Gage (1991) found evidence of sperm competition by o
Murrr4er [49]

Answer:

<h2>Males produces less amount of sperms when mated alone.</h2>

Explanation:

Mediterranean fruit flies are also called as medfly. They are a type of pests that are yellow and brown in color and are originated from Sub- Sahara Africa and also found in California, Texas and some other places.

When Matthew Gage analyzed then, he found the males that mate alone produce fewer sperms while those mates in the presence of other males produce more sperms.

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