An insertion mutation occured.
After the mutation, a letter was inserted, and the others remained intact. The number of letters increased by 1.
It would be A. Vestigial Wing because of the vestigial genes that are carried by a fly, both have to be changed (a defect) to produce the bent wing shape.
W. Adenine / Thymine. B. Guanine / Thymine / Cytosine.
The media plays a very important role as a source of information,education and entertainment, whether it is radio, movies or TV. It accommodates the world in to a single village which is saturated of media-information, that cause us to wear what we do, drink what we drink and eat what we eat.
The sky is transparent not blue, it only appears to be blue because of the ocean. but in the night it appears to be dark grey. the sky being blue is considered as an optical illusion.