Multiple Choice
Which statement is true about the circulatory system?
A) The smallest blood vessels in the body are veins.
B) A circulatory system is necessary in any animal whose body is too large or too complex for chemicals exchanged by simple diffusion.
C) Materials are exchanged directly between the blood and body cells.
D) Veins carry blood away from the heart to body organs and tissues.
Correct Answer:
Verified
Correct Answer:
Verified
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