Answer:
(a) 50 dB
Explanation:
It is given that someone gives training to dog that it will run for food when h whistles a 60 dB whistles and it is also given that dog will not come when he whistles a 70 dB we have to tell that when there is peak shift effect then whistle would lead to the dog fastest running.The dog will run fast for food when there is a whistle of 50 dB when thee is a peak shift effect.
so option (A) will be the correct option
The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
The best soil for agriculture in Mesoamerica was found in the southern highland valleys. The soil had been enriched through volcanic eruptions, while the mid climate made the area an ideal place for people to settle.
This is completely correct, Volcanic eruptions produced ash that spread throughout the Mesoamerican region.
Let's have in mind that Mesoamerica (modern-day México) was a region with major volcanoes in the area. The highest peak in México is the volcano "Citlaltepetl," better known as "Pico de Orizaba"(Orizaba Peak). Then, we find two impressive volcanos that divide the state of México and México City with the state of Puebla: the impressive Popocatepetl and the Iztazihuatl.
These volcanoes were very active in Mesoamerican/Precolumbian times and allowed Native Indians to grow quality cash crops.
<span>Because they thought that immigrants </span>would take occupations and jobs from Americans and they
additionally fear the foreigners would bring down the country way of life and
breed wrongdoing and infection in the US.
Immigration has been questionable in this nation as far back
as its beginning. At the core of the contention is fear. The genuine issue with
migrants is, and dependably has been, the dread that these foreigners will
overpower and undermine the lifestyle that makes America great. It is actually
an irony given the fact that the nation as it stands now is a nation of
immigrants :)
