During the swallowing reflex during the swallowing reflex the tongue closes the pharynx breathing rate increases the epiglottis closes the glottis the esophageal sphincter closes the esophagus

I believe that during swallowing the epiglottis closes the glottis. Epiglottis is a leaf-shaped cartilage located behind the tongue, at the top of the larynx, whose main function is to seal off the windpipe during eating, so as to prevent accidental inhalation of food. It is only during the process of swallowing that the epiglottis moves and performs this vital function. 

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.

Yes yes yes yes very good