The blood vessels in the walls of the heart are:- a) pulmonary vessels
b) caval veins
c) coronary vessels
d) Lymph vessels

answer; i believe its echoic memory,it is believed to last three to four seconds; good luck

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.

its probably to later but whats the question