Why did early naturalists think that sponges were plants and not animals?

Early naturalists regarded sponges as plants due to their lack of obvious movement as well as there distinctive branching form. Sponges do not have any organs and their skeleton is fibrous. It wasn't until 1755 and later confirmed by observation in 1765, that changes in the diameter the openings to their central cavity were described, thus proving the animal nature of sponges.

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Essential for a scientist to do for credibility

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.