During development of the heart,
a. the right part of the sinus venosus becomes part of the ventricle.
b. the bulbis cordis is absorbed into the atrium.
c. blood vessels form from blood islands on the surface of the yolk sac.
d. the foramen ovale forms in the interventricular septum.
e. the right and left sides of the heart develop from different segments of the heart tube.
Answer: c
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