★ How the Eyes work Quiz
Lens
A. Clear tissue that covers the eye
B. Opening of the eye
C. Focuses the light
D. Regulates amount of light
Select your answer:
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Human Eye › ViewA dark muscular membrane which controls size of pupil
A. eye
B. iris
C. cornea
D. retina
Heart Structure and Double Circulation › View
This type of blood cell is responsible for fighting disease.
A. red blood cell
B. plasma
C. white blood cell