State governments must follow which type of laws.

The answer is: US federal law

Even though the state governments has the right to create their own law, The US federal law had a supremacy over the law created by the state governments.

This mean that if the laws that created by the state and the federal government contradict each other, the state government must obey/follow the law created by the federal government.

the right answer is a

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.