When conducting scientific research, any information that is found must be analyzed to determine its validity. Joel is a firm believer that exposure to cold weather can cause the common cold. He conducts online research about this topic. Of the excerpts below, which would be considered biased? a. The flu and the common cold are caused by viruses. b. Viruses are passed by contact between people. c. Cold and flu season occurs when the weather is cold, so there must be a connection. d. All of the above excerpts are biased.