Chambray, by contrast, is a fabric defined by the way it is made: a plain weave of colored warp and white filling yarns. It is usually made of cotton fibers, but it can also be made with linen or silk, and its primary use is shirting. credit: Jupiterimages /Polka Dot/Getty Images. Linen is made from flax fibers.
Best Answer: vestigial structures are considered evidence because scientists believe they are structures that were once used by a species ancestors but are not longer needed. these structures do not impair the organism in any way, so there is no need for evolution to get rid of them. for example, the human appendix is considered a vestigial structure. it is believed that in earlier humans, the appendix helped to break down foods like plants.
The others are incorporated into the structures of the face and neck. Heads and Tails. As well as the claim about gill slits, other embryonic structures are claimed to the evidence of evolution. For example human embryos are claimed to have a tail. They do not. It simply appears that way because the backbone develops before the hips and legs, and therefore projects beyond the place where the pelvis and legs grow from.