52. A cell is examined under the microscope and the student distinguished a specific structure to determine that it was a plant cell. Which choice below best represents the function of this specific structure? (SC.6.L14.4) A. An organelle to allow certain materials in and out of the cell. B. An organelle to provide extra structure and support to the cell. C. An organelle that acts as the control center of the cell. D. An organelle to perform chemical reactions to produce energy.​

How do forces between particles in gases compare to forces in the other states of matter? o a. the forces in gases are stronger than forces in solids but weaker than forces in liquids. o b. the forces in gases are weaker than forces in solids but stronger than forces in liquids. o c. the forces in gases are weaker than forces in solids and liquids. o d. the forces in gases are stronger than forces in solids and liquids. submit

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

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.