Heart development begins as
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a
a folding process in the mesoderm below the notochord that is exactly like neural tube formation
b
an outgrowth of the endoderm above the gut that forms a tube that will become the heart
c
a pair of tubes in the lateral plate mesoderm that move together and fuse to form a single tube that will become the heart
d
a mesenchymal condensation below the notochord that forms the heart tube
e
cells from the somitic myotome, which migrate ventrally and form the heart
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