Validity. i am not so sure though!<span />
Answer: c) use a person outside the vehicle to help you if possible.
Explanation:
Back up is the mechanism which is followed by the vehicle for reversing. It is also known as reversing operation.A driver can use rear view mirror and a person outside the vehicle for watching the nearby vehicle and road for safe reverse.
Outsider can provide the exact guidance to back up the vehicle as he/she can clearly see every small element and thus can provide reversing instructions accordingly to the driver .
Other options are incorrect because at time small objects and children aren't visible to the drive and that might cause accident. Side mirrors and rear view mirror are helping equipment present in the car but even though they can miss showing the small element.Thus the correct option is option(c).
B. Richard Nixon
He was president during that time so that’s the only logical answer
Environmental conditions generated regional differences in food, crops and culture.
Explanation:
Each region had different environmental conditions, such as climate and soil type and fertility. This makes the crops, crops and food produced in each region consistent with the environmental conditions in each region.
We can use the apple as an example. The apple is a crop that requires cold weather, deep soil, with high fertility and long days, for example. In this case, apples should be produced in states that had this type of environmental condition, but these conditions were not seen in all states. In this case, the states that did not have the necessary environmental conditions for the apple, planted other crops.
The climate and duration of the day and night also caused changes in the day of harvest and harvest of each culture in each state.
