You are looking at sonograms and are observing fetal bones.Compared to a much earlier sonogram,you can see that this stage of development shows

Question

Quizplus · Accepted Answer

The presence of calcified cartilage in the long bones indicates that they are beginning to ossify and develop into bones. This stage of development is further along than when there is only cartilage present, as in earlier sonograms. Choice B is incorrect because cartilage alone would not show up as bones on a sonogram. Choices C and D are also incorrect as they refer to more advanced stages of bone development which would not be visible on a sonogram.

You Are Looking at Sonograms and Are Observing Fetal Bones