What is the control center of a cell?

So i have a lot of answers answered but it says i still need to answer more questions. why is it doing that? how many questions need to be answered?

Why would a smoker tend to inhale more deeply and smoke more cigarettes when he or she switches to low nicotine cigarettes

A12 pound cat is prescribed amoxicillin at 5mg/kg twice a day for seven days the oral medication has a concentration of 50mg/ml how many mls will the cat need per day