Science relies on hypothesis, experimentation, data collection, data analysis, drawing conclusions from data, sharing of data, changing conclusions based on new data, etc.
The answer is primary. That means the answer is a.
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A federal government is the type of government that combines aspects of both unitary and confederal government. The United States has a federal government.
The correct answer is C. This part is called the epithelium.
It is the muscular coat which consists of inner circular and outer longitudinal smooth muscle. Its main work is peristalsis.
To propel urine. The outer layer is the mucosa which has transitional epithelium that continuos with the lining of the renal pelvis and also the urinary bladder.
This layer of its work is to secrete mucus which protects and coats the surface of the cells.
You stroke the ball and roll down throat