Aristotle believed that all species are a. equal in complexity. b. life originated from inorganic substances. c. living organisms can be arranged based on their order of increasing complexity. d. every species on Earth has a perfect or "essential" form.

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.