91.
________ helps the eye to adjust the focal length of the lens.

92.
Eustachian Tube is located in which part of human body?

93.
Glomerulus and Bowman's capsule constitute

94.
The kidneys are stimulated to produce renin

95.
In mammals, an important role of excretion is played by ________

96.
Nephron is related to which of the following system of human body?

97.
Dialysis is used to perform the function of

98.
Excretion is best described as the removal of

99.
Islets of Langerhans are present in

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