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konstantin123 [22]
2 years ago
5

When did oxygen levels start to decline from 35 percent down to today's levels?

Advanced Placement (AP)
2 answers:
lara31 [8.8K]2 years ago
7 0
A. after the carboniferous period
Readme [11.4K]2 years ago
4 0

Oxygen levels start to decline from 35 percent down to today's level after the carboniferous period.

Answer: Option a

<u>Explanation: </u>

The Pangea formation marked the carboniferous period. Pangea has revolutionized land and sea, laying the foundations for new species of plants and animals. A new group of species, diapsids, enters the stage.  

During the carboniferous period, 35 percent of oxygen levels began to fall to current levels. Oxygen levels dropped from 35 percent to their current level about 95 million years ago. Oxygen is a product produced as waste from photosynthesis and used by respiration.

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Alexxandr [17]

Answer:

An equivalent hydroelectric plant can provide up to 8.2 million homes in the United States.

Explanation:

According to the U.S. Energy Information Administration, a typical U.S. home has an average yearly consumption of 10972\,kWh in 2018. The quantity of house that can be provided is:

n = \frac{(90\,TWh)\cdot \left(10^{9}\,\frac{kWh}{TWh}\right)}{10972\,kWh}

n = 8202697.776\,houses

An equivalent hydroelectric plant can provide up to 8.2 million homes in the United States.

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What is the net charge of two ions bonded together ?
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In florida and some other states, cellular emergency calls are directed to the state police (*__________ on your cellular phone)
dedylja [7]

The Cadillac Corporation has, in fact, already introduced their Onstar System in the 1997 model year. It links a hand-held, voice-activated phone with a GPS satellite device. Onstar allows dispatchers in customer service centers to locate Cadillac owners who are in distress, or who locked their keys in their cars. Emergency response can be dispatched from the Cadillac operated service centers.

In some states, including California, Colorado, Maryland, Virginia, Delaware, Texas and Florida, the cellular emergency calls are directed to the state police. The increase in the number of calls has been so great, that these states are attempting to build infrastructures to handle the volume of calls received.

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2 years ago
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David is a 6’3”, 320-pound, middle-aged man who feels tired all the time and suffers from a variety of issues including sleep di
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The likely reason that David is experiencing this symptoms or the current issues that he is facing is because he is probably experiencing sleep deprivation. This is a condition where in a person does not have enough sleep in which David has and that it could cause effects in the brain, as well as it will affect the cognitive function where in, David experiences memory issues.

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2 years ago
What is the solution of StartFraction 1 Over c minus 3 EndFraction minus StartFraction 1 Over c EndFraction = StartFraction 3 Ov
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Answer:

  • <u><em>All real numbers except c = 0 and c = 3.</em></u>

Explanation:

The equation is:

   \dfrac{1}{c-3}-\dfrac{1}{c}=\dfrac{3}{c(c-3)}

Since c - 3, c, and c(c - 3) are he denominators, none of them can be equal to zero:

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Now you can multiply both sides of the equation by the common denominator: c (c - 3):

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