What is the discharge of a stream?

a the amount and type of sediment dissolved in a volume of water

b the speed at which the water moves on the surface

c the measure of the change in elevation over a distance

d the measure of the volume of water that a stream carries in a set time

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.