★ Heart Structure and Double Circulation Quiz
This is the thickest of the blood vessels. It leads away from the heart.
A. veins
B. capillaries
C. arteries
Select your answer:
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Excretion › ViewTo conserve precious salts, freshwater fish…
A. produce small amounts of urine
B. significantly dilute their urine
C. do not take up water
D. drink through their gills
The Human Eye › View
What is the aqueous humor?
A. fibers that hold the lens in place
B. thin structure that controls pupil
C. clear, watery fluid
D. helps refract light to the retina