I believe A. Barnacles living on a whale's skin is an example of a particular symbiotic relationship.
<span>The bonds are covalent and, therefore, directional. They will only bond in one direction, which means that fewer electrons can bond to these materials, leading to a relatively low total number of electrons in the material, and therefore a lower overall density.</span>
C. Vestigial.
A vestigial structure example in out bodies is the Appendix. We don't really need it, it just kind of "hangs out" in our bodies. We evolved to not need it.
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Explanation:
Skin cells are specialized to be quickly shed and replaced, and do not have much mitochondria (which helps produce energy). Muscle cells, conversely, have lots of mitochondria because they need energy to produce movement.
A skin cell should proliferate very well and at the same time be protected against UV radiation, it would be important to have a function in which is cell is flexible, but also comparably hard.
A muscle cell needs a huge metabolism, a certain way to function, UV protection on the other side is really not its business.
