Which is the function of the valves within the heart and veins?

Which of the following is not a product of the second stage of glycosis

Which of the following shows the correct order in which light information travels through the eye? (2 points) lens, pupil, retina, optic nerve pupil, lens, retina, optic nerve pupil, lens, optic nerve, retina lens, pupil, optic nerve, retina

Which of the following is not a food produced in rainforests? a) coffee b) cocoa c) avocados d) wheat