There are three main reasons why people are concerned that cell phones (also known as “mobile” or “wireless” telephones) might have the potential to cause certain types of cancer or other health problems:
Cell phones emit radiofrequency energy (radio waves), a form of non-ionizing radiation, from their antennas. Tissues nearest to the antenna can absorb this energy.
The number of cell phone users has increased rapidly. As of December 2014, there were more than 327.5 million cell phone subscribers in the United States, according to the Cellular Telecommunications and Internet Association. This is a nearly threefold increase from the 110 million users in 2000. Globally, the number of subscriptions is estimated by the International Telecommunications Union to be 5 billion.
Over time, the number of cell phone calls per day, the length of each call, and the amount of time people use cell phones have increased. However, improvements in cell phone technology have resulted in devices that have lower power outputs than earlier models.
Answer:
a
Explanation:
It is most likely that the sisters would go seek out old middens because they would associate the presence of middens with food sources. It is possible that they would not have made the connection between seeds and new plants, because if that were so they would begin taking economic advantage of the seeds. They may have supposed that for some strange reason or cycle the middens produced food after have been inactive for a certain amount of time.
The troposphere gets its heat from the ground, and so temperature decreases with altitude. Warm air rises and cool air sinks and so the troposphere is unstable. In the stratosphere, temperature increases with altitude.
SO the answer is C. Troposphere and Stratosphere.
The answer to the question above is the increase in trade.
The increase in trade contributed to the rise of cities in the High Middle Ages. The High Middle Ages, also known as the High Medieval Period, started from AD 1000 which lasted until 1250. The Renaissance period of the 12th century happened during this age.
