Imagine that you have found the remnants of a robin's egg on the ground. From your biology course, you know that this eggshell is composed of calcium. What else can be said of this eggshell?

Question

Quizplus · Accepted Answer

Osteoclasts are cells that break down bone tissue and release calcium into the bloodstream, which can then be used for other purposes such as eggshell formation. Therefore, it is likely that osteoclasts played a key role in providing the calcium for the robin's eggshell. Option A is not likely as calcium in the diet is absorbed into the bloodstream and then deposited into the bones, which can then be utilized for eggshell formation. Option C is not correct as spongy bone is not typically found in eggshells. Option D is not correct as a robin's beak does not contain enough calcium to form an eggshell.

Imagine That You Have Found the Remnants of a Robin's