How do organelles interact in the production and use of hemoglobin found in theses cells

Alaska and northern canada have a diet rich in vitamin d and their skin color is darker than predicted on the basis of iv intensity at their latitude. explain the observation:

Idont understand by supporting the plant and holding the leaves up to the light. question 3 options: tap or fibrous root flower petals herbaceous or wood stems leaves with stomata

Describe how a student should adjust the microscope to see the cells on a slide more clearly?