Guided by powerful signaling molecules, the human heart develops from
a. ectoderm and endoderm.
b. ectoderm.
c. blood cells.
d. mesoderm.
e. endoderm.
Answer: d. mesoderm.
Anatomy & Physiology
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A. axial skeleton. B. appendicular skeleton.
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The most important metabolic fuel molecule in the body is
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Anatomy & Physiology