Use the Following Information as Background for the Next Few

Use the following information as background for the next few questions.
Scientific studies have shown that ectrodactyly, a condition involving deficient or absent digits on the hand or foot, may be caused by a defect in the apical ectodermal ridge of an embryo's limb bud.
-This condition affects development in which axis?

A) proximal-distal
B) left-right
C) anterior-posterior
D) dorsal-ventral
E) transverse

Correct Answer:

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