Placing a suspect at the scene of a crime is an important element in criminal investigation. this can be achieved through the location of textile fibers similar to those from the victim's clothing or the crime scene on the clothing of the suspect, or through the discovery of fibers like those in the suspect's clothing at the crime scene. a fiber is the smallest unit of a textile material that has a length many times greater than its diameter. fibers can occur naturally as plant and animal fibers, but they can also be man-made. a crime scene victim is wearing running shorts. there are some fibers on the victim's legs below the shorts. the fibers on the victim's legs dissolved in hydrochloric acid and so did the fibers that made up her running shorts. the fibers are a) cotton. b) nylon. c) silk. d) wool.

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic