Cataracts, the medical condition where the lens of the eye becomes cloudy, are a leading cause of blindness. describe how developing a cataract would change the path of light through the eye.

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?

Which of the follow describes a disadvantage secondary sources have compared to primary sources?