According to the nebular hypothesis, which of the following is true? A. The nebula expanded outward.
B. Gas and dust flattened into a disk shape.
C. The sun used up all the gases in the nebula.
D. The planets were created by the solar wind.

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.