Which statement is most accurate about energy absorbed and released in this chemical reaction? pls help im being timed

Mg(OH)2 → MgO + H2O [ΔH = 37.1 kJ]

A. It is an endothermic reaction and energy is released from the system

B. It is an endothermic reaction and energy is absorbed by the system

C. It is an exothermic reaction and energy is absorbed by the system

D. It is an exothermic reaction and energy is released from the system

How have the greenhouse gasses increased from the year 2000 to 2018

If blood contains 150g of hemoglobin per liter of blood, how much hemoglobin would be contained in 10 ml of blood

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.