Answers created by Ken

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• What is a "dual gland" in the human body?
  
• How many nebulae are there in total?
  
• How do you solve #9- 9x - 5- 3x = 7#?
  
• If a pipe can fill a tank in x hours, what fractional part of the tank will be filled in one hour?
  
• Are arteries, veins and capillaries part of the circulatory, endocrine, excretory, or respiratory system?