Calcium absorbed from the yolk and shell of an egg is used by the embryo to make its?

The correct answer is related to the development of the embryo during its growth within the egg. Calcium plays a crucial role in forming the skeleton of the developing chick. As the embryo grows, it requires calcium to build strong bones and establish a healthy skeletal structure, which is essential for the chick's mobility and overall health after hatching. The yolk and shell of the egg provide the necessary calcium that is absorbed by the embryo to facilitate this process.

The other options, while related to the chick's development, do not directly correlate with calcium usage in the same way. Feathers arise from keratin, which is a protein, and skin is formed from different cellular structures that do not rely primarily on calcium. The beak, although it eventually requires some minerals, is primarily made of keratin as well and develops differently than the bones. Therefore, the primary developmental use of calcium from the egg is in the formation of the skeleton.