All of the following are requirements to serve in the senate except:
a. a candidate must be at least 30 years old.
b. a candidate must be a resident of the state he/she wishes to represent.
c. a candidate must be born in the united states.
d. a candidate must be a citizen of the united states.

c. A candidate must be born in the United States.

Explanation:

According to Article I, section 3 clause 3 of the Constitution of the United States, it is clearly stated that

"No Person shall be a Senator who shall not have attained to the Age of thirty Years, and been nine Years a Citizen of the United States, and who shall not, when elected, be an Inhabitant of that State for which he shall be chosen."

So, any candidate for a senator has to be a citizen of the country and must be at least more than 30 years of age. He must also be a resident of that place he wishes to represent, meaning he must be a legal resident of the state from which he wishes to be the Senator of. But there is no rule as such for him/her to be a born in the United States.

uses : -

1.aneroid barometers primarily measure whether pressure is rising or falling.

2.aneroid barometers are often used for reading pressure in homes and recreational boats.  

3.other uses may include barographs in meteorology and altimeters in modern aircraft.  

4.this type of barometer can announce whether a high or low pressure system is coming or whether it is becoming more intense.  

5.there are different types of aneroid barometers, such as the altimeter, which measures altitude, or distance above sea level.  

6.another example is a barograph, which is a modified aneroid barometer that provides constant readings of atmospheric pressure on graph paper.  

7.when used in this capacity, the aneroid barometer can store a week's worth of data.

android diameter a device for measuring atmospheric pressure , often specially calibrated for use as an altimeter ,consisting of a box or chamber partially exhaused of air, having an elastic top and a pointer to indicate the degree of compression of the top caused by the external air

refer to the attachment for the characteristics : -

answer; the parasympathetic nervous system;