In 1687, Sir Isaac Newton published his famous book describing gravitational law. Which statement is correct about gravitational law? Group of answer choices

A. It is made by a government.

B. It is a societal law.

C. It is changed at regular intervals.

D. It is a scientific law.

Please but a explanation on how you got the answer you put,

In which situation can a mixture always be called a solution

Identify the electromagnets with poles that are reversed from the electromagnet shown above

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.