Which gland is often called the master gland because many of its hormones stimulate the activities of other glands?
1. adrenal
2. pituitary
3. pancreas
4. parathyroid
5. testis
What hormone stimulates the conversion of glycogen to glucose within the cells of the liver?
1. insulin
2. parathyroid
3. glucagon
4. testosterone

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.

d. changes in climate and historical records

hope this