Several factors have contributed to the shrinking size of the American middle class after the early 1970s. One of them includes "the emergence of the low-wage service sector."
Other factors that contributed to the shrinking size of the American middle class during this period include:
Greater demand for higher-skill jobs;
The huge income gap between the high paid executives and employees in the middle ranks;
Fewer opportunities for those with little education.
Global competition and advancement in technology;
Surging education fees, health care, and housing cost;
Hence, in this case, it is concluded that the middle class in the United States is smaller today compared to the time before 1970.
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The answer is B... Hope this helps :)
Answer:
Option D, Fossil in layer 6 are less than 540 million years old
Explanation:
In any fossil deposition, the youngest of fossils lies at the topmost layers while all other layers below it are much older than it.
Here, layer 1 lies at the bottom and layer 13 lies at the top. Thus, layer 1 is the oldest and layer 13 is the youngest fossil.
In the question , it is given that index fossil of age 540 million years old are found at the layer 5, therefore all layer lying above it will be less than 540 million years.
Therefore, option D is correct.
