This is worth 30 points!
what conclusion can be drawn from embryological development?
a. the presence of gill slits and tails in early vertebrate embryosshows that they may share a common ancestor.
b. many organisms have structures with no apparent function found during embryo development.
c. insect and bird wings are similar in function but not in structure.
d. paleontologists have used fossils to trace the evolution of the modern camel.

your anwer is c) The two types of wings share a common function (and therefore are both called ... the bird wing and insect wing did not arise from an original ancestral structure ... When the gill slits became supported by cartilaginous elements, the first set of

the answer is d. chordata

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.