A"chemical imbalance" may refer to an imbalance in electrolytes neurotransmitters hormones nutrition

The answer is B. Neurotransmitters

I'm a 100% sure

answerthe employer shall direct drivers to travel with the load trailing;

answer: if though all maps are biased we study them to tell we have to go and use them to tell the direction we have to go but if you don't want to use a compass to find the way to go then the only option is to use the standard maps made by the european's  

explanation: