Which part of the eye controls whether or not the pupil dilates or constricts? iris retina optic nerve cornea

On a day when the barometer reads 75.23 cm, a reaction vessel holds 250 ml of ideal gas at 20 celsius. an oil manometer ( ρ= 810 kg/m^3) reads the pressure in the vessel to be 41 cm of oil and below atmospheric pressure. what volume will the gas occupy under s. t.p.?

Which of these activities increases the amount of carbon in the atmosphere?

Which of the following describes how a microwave heats food