What is a stem cell? A cell in the brainstem of an animal
A cell in the stem of a plant
A cell that has undergone differentiation
A cell who's role is not yet determined- it is undifferentiated

Explanation:

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"a.) well–developed vascular system."

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.