BacteriaThis domain is more common than Archea and live almost everywhere. Their are more bacteria in the human mouth than there are in the entire world. Some bacteria are harmful, but some can actually be helpful! The main shapes that bacteria usually come in are Cocci, Bacilli, and Spirochete; bacteria can come on many other forms as well though. Strept throat is caused by Cocci, which forms chains to make Streptococci, which ultimately result in Srrept Throat
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